@article{VMUMM_1988_3_a4,
     author = {O. V. Sipacheva},
     title = {Lindel\"of $\Sigma$-spaces of functions and the {Suslin} number},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {18--21},
     publisher = {mathdoc},
     number = {3},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1988_3_a4/}
}