Volume 14, Issue 1, January–March, 1980
ISSN:
00162663 (Print)
15738485 (Online)
In this issue (29 articles)

OriginalPaper
Spectral analysis of a class of secondorder nonselfadjoint differential operators
M. G. Gasymov Pages 1115 
OriginalPaper
Generalization of a theorem of brusotti for curves on a surface of second order
D. A. Gudkov Pages 1518 
OriginalPaper
Evolutionary equations with nontrivial Lie  Bäcklund group
N. Kh. Ibragimov, A. B. Shabat Pages 1928 
OriginalPaper
New inequalities in the topology of real planar algebraic curves
V. A. Rokhlin Pages 2933 
OriginalPaper
Finitezone potentials and integrable systems on a sphere with quadratic potential
A. P. Veselov Pages 3739 
OriginalPaper
Variational principle for equations integrable by the inverse problem method
V. E. Zakharov, A. V. Mikhailov Pages 4344 
OriginalPaper
Properties of bases of some koethe spaces and their subspaces
V. P. Kondakov Pages 4648 
OriginalPaper
Unitary equivalence of sets of selfadjoint operators
S. A. Kruglyak, Yu. S. Samoilenko Pages 4850 
OriginalPaper
A sufficient set of ndimensional representations of a Banach algebra and the nsymbol
N. Ya. Krupnik Pages 5052 
OriginalPaper
Singular integral operators with nonkarleman shift on an open contour
A. G. Myasnikov, L. I. Sazonov Pages 5758
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