シュタイン多様体
↑ PlanetMath: solution of the Levi problem
↑ Y. Eliashberg, Topological characterization of Stein manifolds of dimension > 2, Int. J. of Math. vol. 1, no 1 (1990) 29-46.
↑ R. Gompf, Handlebody construction of Stein surfaces, Ann. of Math. 148, (1998) 619-693.
↑ S. Akbulut and R. Matveyev, A convex decomposition for four-manifolds, IMRN, no.7 (1998) 371-381.