@article{RM_1985_40_4_a31,
     author = {P. M. Gauthier},
     title = {Remarks on a~theorem {of~Keldysh--Lavrent'ev}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {179--180},
     publisher = {mathdoc},
     volume = {40},
     number = {4},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1985_40_4_a31/}
}