A higher dimensional analogue of Kodaira's canonical bundle formula is obtained. As applications, we prove that the log-canonical ring of a klt pair with κ ≤ 3 is finitely generated, and that there exists an effectively computable natural number M such that |MKX| induces the Iitaka fibering for every algebraic threefold X with Kodaira dimension κ = 1.
"A Canonical Bundle Formula." J. Differential Geom. 56 (1) 167 - 188, September, 2000. https://doi.org/10.4310/jdg/1090347529