@article{DE_1981_17_7_a9,
     author = {E. A. Grigor'ev},
     title = {On the stability, in the class of positive solutions, of the time-inverse {Cauchy} problem for the heat equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1250--1255},
     year = {1981},
     volume = {17},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_7_a9/}
}