@book{113763,
	author = {Švecov, P. F. and Koval΄kov, V. P.},
	title = {Geokriologiâ i problemy osvoniâ Severa},
	publisher = {Znanie},
	year = {1987},
	series = {Nauki o Zemle},
	address = {Moskva}
}