@article{ZNSL_1980_96_a8,
     author = {E. M. Il'in and S. V. Sivashinsky},
     title = {Differentiable solutions symmetric systems in plane domains with irregular boundary},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {80--83},
     publisher = {mathdoc},
     volume = {96},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1980_96_a8/}
}