SPER Publications.

New Technologies Publishing House.

Mathematical Society of Japan.

Birkhauser.

Springer Science and Business Media B.V..

Brill Nijhoff.

Springer.

E. Schweizerbart'sche Verlagsbuchhandlung.

Wiley-VCH Verlag.

Springer.

International Journal of Scientific and Technology Research.

9th International Conference on Industrial Technology and Management, ICITM 2020. Institute of Electrical and Electronics Engineers Inc..

American Mathematical Society.

Juliusz Schauder Center for Nonlinear Analysis.

MDPI AG.