Becker, P. J. and Roux, J. J. J. (1981). A bivariate extension of the gamma distribution, *South African Statist. J.*, **15**, 1–12.

Çinlar, E. (1975). *Introduction to Stochastic Processes*, Prentice Hall, New Jersey.

Dussauchoy, A. and Berland, R. (1974). A multivariate gamma type distribution whose marginal laws are gamma, and which has a property similar to a characteristic property of the normal case, *Statistical Distributions in Scientific Works*, Vol. 1 (eds. G. P.Patil, S.Kotz and J. K.Ord), 319–328, Reidel, Dordrecht.

Eagleson, G. K. (1964). Polynomial expansions of bivariate distributions, *Ann. Math. Statist.*, **35**, 1208–1215.

Freund, J. E. (1961). A bivariate extension of the exponential distribution, *J. Amer. Statist. Assoc.*, **56**, 971–977.

Gaver, D. P.Jr. (1970). Multivariate gamma distributions generated by mixture, *Sankhyā Ser. A*, **32**, 123–126.

Ghirtis, G. C. (1967). Some problems of statistical inference relating to double gamma distribution, *Trabajos de Estadistica*, **18**, 67–87.

Johnson, N. L. and Kotz, S. (1972). *Distributions in Statistics*, Vol. 4, Houghton Mifflin, Boston.

Kibble, W. F. (1941). A two-variate gamma distribution, *Sankhyā*, **5**, 137–150.

Kowalczyk, T. and Tyrcha, J. (1989). Multivariate gamma distributions-properties and shape estimation, *Statistics*, **20**, 465–474.

Krishnaiah, P. R. and Rao, M. M. (1961). Remarks on a multivariate gamma distribution, *Amer. Math. Monthly*, **68**, 342–346.

Krishnaiah, P. R., Hagis, P. and Steinberg, L. (1963). A note on the bivariate chi-distribution, *SIAM Rev.*, **5**, 140–144.

Lingappaiah, G. S. (1984). Bivariate gamma distribution as a life test model, *Applikace Matematiky*, **29**, 182–188.

Mathai, A. M. and Moschopoulos, P. G. (1991). On a multivariate gamma, *J. Multivariate Anal.*, **39**, 135–153.

Miller, K. S., Bernstein, R. I. and Blumenson, L. E. (1958). Generalized Rayleigh processes, *Quart. Appl Math.*, **16**, 137–145 (Correction: ibid. (1963). **20**, p. 395).

Moran, P. A. P. (1967). Testing for correlation between non-negative variates, *Biometrika*, **54**, 385–394.

Moran, P. A. P. (1969). Statistical inference with bivariate gamma distributions, *Biometrika*, **56**, 627–634.

Moran, P. A. P. (1970). The methodology of rain making experiments, *Review of the International Statistical Institute*, **38**, 105–115.

Sarmanov, I. O. (1970). Gamma correlation process and its properties, *Dokl. Akad. Nauk SSSR*, **191**, 30–32 (in Russian).

Steel, S. J. and leRoux, N. J. (1987). A reparameterisation of a bivariate gamma extension, *Comm. Statist. Theory Methods*, **16**, 293–305.

Wilks, S. S. (1962). *Mathematical Statistics*, Wiley, New York.