About the Authors

Qammar Rubbab

Affiliation Department of Mathematics, Air University, Multan Campus, Pakistan

Dumitru Vieru

Affiliation Department of Theoretical Mechanics, Technical University of Iasi, Iasi, Romania

Corina Fetecau

Affiliation Department of Theoretical Mechanics, Technical University of Iasi, Iasi, Romania

Constantin Fetecau

c_fetecau@yahoo.com

Affiliations Department of Mathematics, Technical University of Iasi, Iasi, Romania, Member of Academy of Romanian Scientists, Bucuresti, Romania

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: Corina Fetecau QR DV Constantin Fetecau. Performed the experiments: Corina Fetecau QR DV Constantin Fetecau. Analyzed the data: Corina Fetecau QR DV Constantin Fetecau. Contributed reagents/materials/analysis tools: Corina Fetecau QR DV Constantin Fetecau. Wrote the paper: Corina Fetecau QR DV Constantin Fetecau. Graphics in Mathcad: Corina Fetecau.