@book{18681,
	author = {Landis, E. M. and Rozhkovskaya, Tamara ; tr.},
	title = {Second order equations of elliptic and parabolic type},
	publisher = {American Mathematical Society},
	year = {1998},
	series = {Translations of Mathematical monographs},
	address = {Providence},
	note = {"Purchased under NBHM grant for the year 1998-99"}
}