@article{GDZPPN002422360, title = {Cross Sections in Fibrations.}, journal = {Mathematische Zeitschrift}, volume = {166}, year = {1979}, pages = {7-14}, zbl = {0388.55012}, url = {http://dml.mathdoc.fr/item/GDZPPN002422360} }
Ehrlich, Karel. Cross Sections in Fibrations.. Mathematische Zeitschrift, Tome 166 (1979) pp. 7-14. http://gdmltest.u-ga.fr/item/GDZPPN002422360/