Extensions of Caristi-Kirk's theorem
On the additive group structure of nonstandard models of Z
Normal boundary value problems for differential equations of higher order
F. G. MAKSUDOV, Z. I. ISMAILOV
Absolutely representing systems and convolution operators in the complex domain
The group structure of Hecke groups H $(lambda_q)$
On comformally flat Lorentzian spaces satisfying a certain condition on the curvature tensor
$T_2$-objects in categories of filter and local filter convergence spaces
($sigma$, $tau$)-Lie ideals in prime rings with derivation