[1] Bender C M and Boettcher S 1998 Phys. Rev. Lett.
80 5243 [arXiv:physics/9712001].

[2] Fernandez F M, Guardiola R, Ros J and Znojil M 1998
J. Phys. A: Math. Gen. 31 10105

[3] Cannata F, Junker G and Trost J 1998 Phys. Lett. A
246 219 [arXiv:quant-ph/9805085].

[4] Bender C M, Boettcher S and Meisinger P 1999 J. Math.
Phys. 40 2201 [arXiv:quant-ph/9809072]

[5] Bender C M, Dunne G V and Meisinger P 1999 Phys.
Lett. A 252 272

[6] Khare A and Mandal B P 2000 Phys. Lett. A 272
53 [arXiv:quant-ph/0006126]

[7] Znojil M, Cannata F, Bagchi B and Roychoudhury R 2000
Phys. Lett. B 483 284 [arXiv:hep-th/0003277]

[8] Mostafazadeh A 2002 J. Math. Phys. 43 205

[9] L\'{evai G and Znojil M 2000 J. Phys. A: Math. Gen.
33 7165

[10] Znojil M 2005 J. Math. Phys. 46 062109

[11] Bagchi B and Quesne C 2002 Phys. Lett. A 300
18

[12] Jia C S, Zeng X L and Sun L T 2002 Phys. Lett. A
294 185

[13] Jia C S, Li S C, Li Y and Sun L T 2002 Phys. Lett.
A 300 115

[14] Jia C S, Sun Y and Li Y 2002 Phys. Lett. A
305 231

[15] Jia C S, Yi L Z, Zhao X Q, Liu J Y and Sun L T 2005
Mod. Phys. Lett. A 20 1753

[16] Bender C M, Brody D C and Jones H F 2004 Phys. Rev.
Lett. 93 251601

[17] Bender C M, Jones H F and Rivers R J 2005 Phys.
Lett. B 625 333

[18] Bender C M, Brody D C, Chen J H, Jones H F, Milton K A
and Ogilvie M C 2006 Phys. Rev. D 74 025016

[19] Deb R N, Khare A and Roy B D 2003 Phys. Lett. A
307 215

Baye D, L\'{evai G and Sparenberg J M 1996 Nucl.
Phys. A 599 435

[20] Ahmed Z 2000 Phys. Lett. A 273 343

[21] Huang F J, Qi R, Li Y D and Liu W M 2007 Europhys.
Lett. 79 10004

[22] Fu Y P, Wang D, Li Y D and Liu W M 2007 J. Phys.:
Cond. Matt. 19 496220

[23] Jiang Z F, Li R D, Zhang S C and Liu W M 2005 Phys.
Rev. B 72 045201

[24] Sheng C T, Feng L H, Jie M, Quan Z S and Gui Z S 2003
Chin. Phys. Lett. 20 358

[25] You G J, Jie M and Xin X F 2003 Chin. Phys. Lett.
20 602

[26] Jia C S, Wang P Q, Liu J Y and He S 2007 Int. J.
Theor. Phys. doi: 10.1007/s10773-008-9685-2

[27] Jiang L, Yi L Z and Jia C S 2005 Phys. Lett. A
345 279

[28] Jia C S, Yi L Z and Sun Y 2008 J. Math. Chem.
43 435

[29] Bagchi B, Quesne C and Roychoudhury R 2005 J. Phys.
A 38 L647

[30] Roy B and Roy P 2005 J. Phys. A 38 11019

[31] Mustafa O and Mazharimousavi S H 2007 Int. J. Theor.
Phys. doi: 10.1007/s10773-007-9470-7

[32] Tezcan C and Sever R 2007 Int. J. Theor. Phys. doi:
10.1007/s10773-007-9589-6

[33] Jia C S and Dutra A S 2006 Int. J. Theor. Phys.
39 11877

[34] Mustafa O and Mazharimousavi S H 2007 J. Phys. A
40 863

[35] Jia C S, Liu J Y, Wong P Q and Che C S 2007 Phys.
Lett. A 369 274

[36] Jia C S and Dutra A S 2007 Ann. Phys.
doi:10.1016/j. aop.2007.04.007

[37] Serra L and Lipparini E 1997 Europhys. Lett.
40 667

[38] Von Roos O 1983 Phys. Rev. B 27 7547

[39] de Saavedra F A, Boronat J, Polls A and Fabrocini A 1994
Phys. Rev. B 50 4248

[40] Kennedy P 2005 J. Phys. A 35 689 [arXiv:
hep-th/ 0107170]

[41] Fl\"uge S 1971 Practical Quantum Mechanics I$\!$I
(Berlin: Springer)

[42] Nikiforov A F and Uvarov V B 1988 Special Functions
of Mathematical Physics (Basel: Birkhauser)

[43] de Castro A S and Hott M 2007 Phys. Lett. A
342 53

[44] Wong C W 1991 Introduction to Mathematical
Physics-Methods and Concepts (Oxford: Oxford University)

[45] Costa L C, Prudenter F V, Acioli P H, Neto J J S and
Vianna J D M 1990 J. Phys. B 32 2461