@article{ZNSL_2008_355_a4,
     author = {A. Vershynina and S. L. Gefter},
     title = {On analytic solutions of the heat equation with an operator coefficient},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {139--162},
     publisher = {mathdoc},
     volume = {355},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2008_355_a4/}
}