@article{MZM_1984_36_3_a2,
     author = {N. Ya. Beznoshchenko},
     title = {Nonuniqueness of the solution of the problem of determining the coefficients of the leading terms of equations in partial derivatives},
     journal = {Matemati\v{c}eskie zametki},
     pages = {305--308},
     publisher = {mathdoc},
     volume = {36},
     number = {3},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1984_36_3_a2/}
}