We describe 4-dimensional complex projective manifolds admitting a simple normal crossing divisor of the form among their hyperplane sections, both components and having sectional genus zero. Let be the hyperplane bundle. Up to exchanging the two components, is one of the following: 1) is a scroll over with itself a scroll and a fibre, 2) with where , is the tautological line bundle, , and , where : is the scroll projection. This supplements a recent result of Chandler, Howard, and Sommese.
"On reducible hyperplane sections of 4-folds." J. Math. Soc. Japan 53 (3) 559 - 563, July, 2001. https://doi.org/10.2969/jmsj/05330559