**Contents****Research papers**

- Romi F. Shamoyan, Olivera R. Mihić: On some extremal problems in Bergman spaces in weakly pseudoconvex domains
- Xiaoyuan Wang, Wenchang Chu: Approach of q-Derivative Operators to Terminating q-Series Formulae
- Abderrahim Zagane, Mustapha Djaa: Geometry of Mus-Sasaki metric
- Gurupadavva Ingalahalli, C.S. Bagewadi: A Study on φ-recurrence τ -curvature tensor in (k, μ)-contact metric manifolds
- Amir Baghban, Esmaeil Abedi: A new class of almost complex structures on tangent bundle of a Riemannian manifold
- Jana Fialová: A sequence adapted from the movement of the center of mass of two planets in solar system
- Julien Roth: New stability results for spheres and Wulff shapes