J. Morales, G. Ovando, J. López-Bonilla, R. López-Vázquez.
T. P. Suresh, and K. M. Udayanandan
Victor V. Apollonov, Sergei M. Silnov
S.A. Orlov
M.A. Jafarov, E.F. Nasirov, S.A.Jahangirova, R.M.Mammadov
Tzanko Tzankov, Rosen Iliev, Boyko Ranguelov
Raghda A.M. Attia, Dianchen Lu and Mostafa M.A. Khater
Norodin A. Rangaig