@article{DE_2004_40_3_a12,
     author = {A. Yu. Popov and I. V. Tikhonov},
     title = {Uniqueness {Classes} in a {Time-Nonlocal} {Problem} for the {Heat} {Equation} and {Complex} {Eigenfunctions} of the {Laplace} {Operator}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {396--405},
     publisher = {mathdoc},
     volume = {40},
     number = {3},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_3_a12/}
}