@article{VMUMM_2015_5_a5,
     author = {M. B. Banaru},
     title = {The axiom of cosymplectic surfaces and $W_4$-manifolds},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {34--37},
     publisher = {mathdoc},
     number = {5},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2015_5_a5/}
}