@article{02174299, title = {Existence theorems for commutative diagrams.}, journal = {Lobachevskii Journal of Mathematics}, volume = {17}, year = {2005}, pages = {211-228}, zbl = {1069.03040}, language = {en}, url = {http://dml.mathdoc.fr/item/02174299} }
Rechnoi, V. Existence theorems for commutative diagrams.. Lobachevskii Journal of Mathematics, Tome 17 (2005) pp. 211-228. http://gdmltest.u-ga.fr/item/02174299/