@article{DE_1978_14_5_a11, author = {L. M. Kuks}, title = {Unboundedness of the solutions and a comparison theorem of {Sturm} type for higher order parabolic systems on the plane}, journal = {Differencialʹnye uravneni\^a}, pages = {878--884}, publisher = {mathdoc}, volume = {14}, number = {5}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1978_14_5_a11/} }