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 Homogeneous separable Abelian torsion-free groupsV. I. Myshkin 3 The first boundary-value problem for certain semi-bounded hypo-elliptic equationsV. P. Mikhailov 10 The sieve method in algebraic fields. Lower boundsA. I. Vinogradov 52 Necessary conditions for optimal control in Banach spacesYu. V. Egorov 79 On the existence of eigenvectors of positive linear operators which are not completely continuousI. A. Bakhtin 102 The spectrum of a Volterra operator on a semi-axis and the exponential growth of solutions of systems of integral equations of Volterra typeÉ. I. Gol'dengershel' 115 Letter to the editor concerning the paper of N. F. Otrokov, “Multiple limit cycles”E. A. Leontovich 140 A theorem on unit elements of algebraic fields of order $n$K. K. Billevich 145