[18] A Mostafazadeh, J. Math. Phys. 43 (2002) 205 [19] A Mostafazadeh, J. Math. Phys. 43 (2002) 3944 [20] A Mostafazadeh, J. Math. Phys. 44 (2003) 974 [21] A Mostafazadeh, J. Phys. A : Math. Gen. 38 (2005) 3213 [22] A Sinha and P Roy, Czech. J. Phys. 54 (2004) 129 [23] L Jiang, L Z Yi and C S Jia, Phys Lett A 345 (2005) 279 [24] B P Mandal, Mod. Phys. Lett. A 20 (2005) 655 [25] B Znojil, H B´ıla and V Jakubsky, Czech. J. Phys. 54 (2004) 1143 [26] A Mostafazadeh and A Batal, J. Phys. A : Math. Gen. 37 (2004) 11645 [27] B Bagchi and C Quesne, Phys. Lett. A 301 (2002) 173 [28] L Solombrino, J. Math. Phys. 43 (2002) 5439 [29] T V Fityo, J. Phys. A : Math. Gen. 35 (2002) 5893 [30] O Mustafa and S H Mazharimousavi, Czech. J. Phys. 56 (2006) 967 (arXiv: quant-ph/0603237) [31] O Mustafa and S H Mazharimousavi, Phys. Lett. A 357 (2006) 295 (arXiv: quant-ph/0604106) [32] O Mustafa and S H Mazharimousavi, Int. J. Theor. Phys., (2008) in press (arXiv: hep-th/0601017) [33] B Bagchi and C Quesne, Phys. Lett. A 301 (2002) 173 [34] M Znojil, ” PT -symmetry, ghosts, supersymmetry and Klien-Gordon equa- tion”, (2004) arXiv: quant-ph/0408081 18