@article{ZNSL_1997_242_a2,
     author = {N. V. Khmylko},
     title = {On notion of exactness of bitopological extensions},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {230--236},
     year = {1997},
     volume = {242},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1997_242_a2/}
}