[[1] A. Mitra, J. Math. Phys. 19 (1978) 2018.10.1063/1.523576]Search in Google Scholar
[[2] C. Esebbag, J. Nunez, A. Plastino, G. Bozzolo, J. Phys. A: Math. Gen. 18 (1985) 3505.10.1088/0305-4470/18/18/013]Search in Google Scholar
[[3] N. Bessis, G. Bessis, J. Math. Phys. 21 (1980) 2780.10.1063/1.524398]Search in Google Scholar
[[4] S. Galicia, J. Killingbeck, Phys. Lett. 71A (1979) 17.10.1016/0375-9601(79)90863-6]Search in Google Scholar
[[5] R. N. Chaudhuri, B. Mukherjee, J. Phys. A: Math. Gen. 17 (1984) 3327.10.1088/0305-4470/17/17/010]Search in Google Scholar
[[6] W. A. Karr, C. R. Jamell, Y. N. Joglekar, Am. J. Phys. 78 (2010) 407.10.1119/1.3272021]Search in Google Scholar
[[7] M. Puta, F. Iacob, Ann. Univ. Timisoara XXXIX (2001) 385.]Search in Google Scholar
[[8] A. Gonzalez-Lopez, N. Kamran, P. J. Olver, Contemporary Mathematics 160 (1994) 113.10.1090/conm/160/01569]Search in Google Scholar
[[9] I. I. Cotaescu, P. Gravila, M. Paulescu, Int. J. Mod. Phy. C 19 (2008) 1607-1615.10.1142/S012918310801314X]Search in Google Scholar
[[10] F. Iacob, Phys. Lett. A 374, 11-12, 1332-1335 (2010).10.1016/j.physleta.2009.10.048]Search in Google Scholar
[[11] F. Iacob, Centr. Eur. J. Phys. 12 (2014) 628.]Search in Google Scholar
[[12] F. Iacob, M. Lute, J. Math. Phys. 56 (2015) 12.10.1063/1.4936309]Search in Google Scholar
[[13] L. E. Ballentine, Quantum Mechanics: A Modern Development (WS Publ.London, 2000).]Search in Google Scholar
[[14] J. Wilkinson, The Algebraic Eigenuafue Problem, Clarendon Press, Oxford, (1965). 6]Search in Google Scholar