Vol. 68, No. 1/2, Morphology, Anatomy and Systematics at the Centenary of Wilhelm Troll's Birth (1999), pp. 33-37 (5 pages) Scientific terms should denote similar, comparable, or at the best ...

A necessary and sufficient condition is given for a nontrivial homology class of a simply connected 4-manifold to be represented by a simple, topologically locally flat embedding of a compact Riemann ...