Geodesic
A class of pseudodifferential equations of principal type having no solutions
Doklady Akademii Nauk, Tome 209 (1973) no. 4, pp. 775-777.

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     author = {Yu. V. Egorov and P. R. Popivanov},
     title = {A class of pseudodifferential equations of principal type having no solutions},
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Yu. V. Egorov; P. R. Popivanov. A class of pseudodifferential equations of principal type having no solutions. Doklady Akademii Nauk, Tome 209 (1973) no. 4, pp. 775-777. http://geodesic.mathdoc.fr/item/DAN_1973_209_4_a4/