@article{SM_1973_21_3_a0,
     author = {M. I. Vishik and A. V. Fursikov},
     title = {Analytic first integrals of nonlinear parabolic equations and their applications},
     journal = {Sbornik. Mathematics},
     pages = {339--369},
     year = {1973},
     volume = {21},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1973_21_3_a0/}
}