The group structure of Hecke groups H $(lambda_q)$

İ. N. CANGÜL

A note on double sequences of fuzzy numbers

E. SAVAŞ

Normal boundary value problems for differential equations of higher order

F. G. MAKSUDOV, Z. I. ISMAILOV

Star topological groupoids

O. MUCUK

A property of Meldrum groups

S. ATLIHAN, A. O. ASAR

Extensions of Caristi-Kirk's theorem

M. O. DIALLO, M. OUDADESS

On comformally flat Lorentzian spaces satisfying a certain condition on the curvature tensor

M. ERDOĞAN

Absolutely representing systems and convolution operators in the complex domain

Yu F. KOROBEINIK

($sigma$, $tau$)-Lie ideals in prime rings with derivation

Muharrem SOYTÜRK

$T_2$-objects in categories of filter and local filter convergence spaces

M. BARAN