@article{ZNSL_1997_242_a1,
     author = {A. A. Ivanov},
     title = {Bitopologies of products and ratios},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {217--229},
     year = {1997},
     volume = {242},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1997_242_a1/}
}