-
[1]
M. J. Sparnay, Physica, 24(1958), 751.[2] H. B. G. Casimir, Proc. K. Ned. Akad. Wet., 51(1948), 793.[3] J. Mehra, Physica, 37(1967), 145.[4] J. Schwinger, Lett. Math. Phys., 1(1975), 43.[5] J. Ambjorn and S. Wolfram, ACLT 68-855(1981).[6] C. M. Hargreaves, Proc. K. Akad. Wet, B68(1965), 231.[7] T. H. Boyer, Phys. Rev., 174(1968), 1764,[8] B. Dvies, J. Math. Phys., 13(1972), 1324.[9] R. Balian and B. Duplantier, ANN. Phys., 122(1978), 165.[10] K. A. Milton, L. L. DeRaad. Jr., and, J. Schnringer Ann. Phys. (NY), 115(1978), 388.[11] I. Brevik, Ann. Phys., 138(1982), 36.[12] Xue She-sheng and Xian Ding-chang, Acta Physics Sinica, 34(1985), 1084.[13] W. Magnus, F. Oberhettinger and R.P. Soni, "Formulas and Theorems for the Special Functions of Ma-thematical Physics", Springerverlag,3rd ed.(1966).