Template:Ghys&Langevin&Walczak1988
From Manifold Atlas
É. Ghys, R. Langevin and P. Walczak, Entropie géométrique des feuilletages, Acta Math. 160 (1988), no.1-2, 105–142. MR926526 (89a:57034) Zbl 0666.57021