@article{ZNSL_1995_231_a6,
     author = {N. V. Morozova},
     title = {Certain properties of bitopological spaces},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {135--140},
     publisher = {mathdoc},
     volume = {231},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1995_231_a6/}
}