Linking to Project Euclid

This page explains how to build links to content in Project Euclid. Sections include:

• Linking to Journal Current Issues
• Linking to Journal Past Issues
• Linking to Articles in Euclid
• Finding Euclid Article Identifiers and Persistent URLs
• Finding Euclid Past Issue Identifiers
• Direct Linking to Euclid using IDlookup
• URL Shortcuts
• Euclid Logos

Linking to Journal Current Issues

Every journal in Project Euclid has a main, or "home," page that displays the current issue's Table of Contents. This is the best page to link to if you wish to link to a publication at the journal title level, as opposed to a specific issue or specific article.

All URLs to journal home pages in Euclid begin with "projecteuclid.org/" and are followed by a short journal abbreviation. For example:

These journal URLs are all displayed on the detailed Euclid journal list.

N.B. Once you click on a journal URL, you may notice that the URL in your browser address bar will change to something like this:

DO NOT bookmark or store this URL, since it is not guaranteed to be persistent, and it points to a specific issue and will continue pointing to the same issue, even when that issue is no longer the most recent. To point to a journal's current issue, use the projecteuclid.org URL together with the journal abbreviation.

Linking to Journal Past Issues

Every journal issue within Euclid has a unique, persistent identifier that looks something like this:

With this identifier it is possible to create a direct link to this issue's Table of Contents page. All Table of Contents pages in Euclid are "open access"—that is, there are no restrictions on who can view these pages.

The base for constructing a complete URL that points to a past issue is:

To point to a specific journal issue, add the Euclid issue identifier to the end of this base URL. The result will look like this:

See below for an explanation on how to discover a past issue's identifier. See also the note in the following section regarding the persistence of Euclid URLs.

Linking to Articles in Euclid

Every article within Euclid has a unique, persistent identifier that looks something like this:

With this identifier it is possible to create a direct link to this article's abstract page. All article abstract pages in Euclid are "open access"—that is, there are no restrictions on who can view these pages.

The base for constructing a complete URL that points to an article is:

To point to a specific article, add the Euclid article identifier to the end of this base URL. The result will look like this:

See the next section for an explanation on how to find an article's identifier.

N.B. This type of Euclid URL provides a persistent URL for linking to an issue or article in Project Euclid. Other Euclid URLs, including what appears in your browser address bar, are not guaranteed to be persistent and should not be bookmarked or stored.

Finding Euclid Article Identifiers and Persistent URLs

There are two methods for discovering Euclid article identifiers and constructing persistent URLs. The first involves browsing or searching for the article you want to point to; the second uses a programmatic method for harvesting identifiers.

(1) Persistent Euclid article URLs are displayed on every article abstract page in Euclid. Anyone can view an article abstract page in Euclid. If you browse a journal issue and click on "view abstract," or perform a Euclid search and click on the article title, you will easily find the abstract page. There is a section on every abstract page called "Links and Identifiers," and the first item listed will be the persistent Euclid URL for that article.

(2) Euclid also provides a programmatic method for retrieving Euclid article identifiers, using the Euclid IDlookup request. Once retrieved, a Euclid article identifier can be used to construct a persistent URL, using the method described above. This approach assumes that you have three pieces of data about the article in question: the journal ISSN, the volume number, and the page number on which the article begins. Note that some titles have changed names and ISSNs over time. The ISSNs used in the IDlookup database are identified in the journal details on the Euclid Journal Browse page. If a title has both print and electronic ISSNs, both should be recognized by IDlookup.

This data is encoded in an "IDlookup" request to Euclid. Such a request should look like this:

The reply for a successful match will look like this:

If IDlook cannot find a match for a request, the reply will look like this:

Finding Euclid Past Issue Identifiers

Euclid provides a programmatic method for retrieving journal issue identifiers, using the Euclid IDlookup request. This approach assumes that you have three pieces of data about the issue in question: the journal ISSN, the volume number, and the issue number.

This data is encoded in an "IDlookup" request to Euclid. Such a request should look like this:

The reply for a successful match will look like this:

If IDlook cannot find a match for a request, the reply will look like this:

N.B. Euclid's IDlookup accepts requests for both issue and article identifiers. If a page argument (e.g., "page=2") is present in the request, IDlookup assumes an article lookup, and it will only look for articles that match the request criteria. This is true even if the issue argument is present.

Direct Linking to Euclid using IDlookup

The IDlookup mechanism described above can also be used to create direct links to articles and issues within Euclid. Normally, IDlookup will return an article or issue identifier, but with the "redirect" argument set, the request is redirected to the target article or issue.

This method of linking into Euclid is not recommended for the creation and storage of permanent URLs to articles and issues within Euclid. For that, we recommend capturing Euclid identifiers and forming persistent URLs as described above. IDlookup redirects are provided as a shortterm solution for link resolvers which require dynamic methods of establishing links based on available metadata. Project Euclid expects to support incoming OpenURLs in the future, at which point it may cease to support IDlookup redirects.

To have IDlookup redirect to the target resource, simply append the key-value pair "redirect=1" to the normal IDlookup request.

If a complete match can be made, the request is redirected to the target resource, either an article or issue record page. If the complete information fails to match, but the ISSN is recognized, the request is redirected to the appropriate title's search page. If the ISSN is not recognized, the request is redirected to the Project Euclid search page.

Note that some titles have changed names and ISSNs over time. The ISSNs used in the IDlookup database are identified in the journal details on the Euclid Journal Browse page. If a title has both print and electronic ISSNs, both should be recognized by IDlookup.

URL Shortcuts

A number of frequently used pages within Euclid have URL shortcuts:

Euclid Logos

Below are images which can be used when creating links to Project Euclid.

	PNG, 16 x 16 pixels
	PNG, 32 x 32 pixels
	PNG, 64 x 64 pixels
	GIF, 55 x 24 pixels
	GIF, 80 x 27 pixels
	GIF, 100 x 32 pixels
	GIF, 125 x 32 pixels
GIF, 216 x 67 pixels
GIF, 400 x 124 pixels (no border)

last modified: 20 December 2011