au.\*:("COVACHEV VC")
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CONSTRUCTION OF A PARAMETRIX FOR A HYPERBOLIC SYSTEM WITH CHARACTERISTICS OF VARIABLE MULTIPLICITYCOVACHEV VC.1980; DOKL. BOLG. AKAD. NAUK; ISSN 0366-8681; BGR; DA. 1980; VOL. 33; NO 10; PP. 1313-1316; BIBL. 9 REF.Article
