Kumari, Rani
Sarkar, Jaydeb
Sarkar, Srijan
Timotin, Dan
Funding for this research was provided by:
National Board of Higher Mathematics, India (NBHM/R.P.64/2014)
Romanian National Authority for Scientific Research, CNCS–UEFISCDI (PN-II-ID-PCE-2011-3-0119)