Geodesic
On the stability, in the class of positive solutions, of the time-inverse Cauchy problem for the heat equation
Differencialʹnye uravneniâ, Tome 17 (1981) no. 7, pp. 1250-1255 
E. A. Grigor'ev. On the stability, in the class of positive solutions, of the time-inverse Cauchy problem for the heat equation. Differencialʹnye uravneniâ, Tome 17 (1981) no. 7, pp. 1250-1255. http://geodesic.mathdoc.fr/item/DE_1981_17_7_a9/
@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/}
}
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