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Hai NT, Yakubovich SB. The double Mellin-Barnes type integrals and their applications to convolution theory. Vol 6 World Scientific Publishing Co., Inc., River Edge, NJ 1992.Edit

Hai NT, Yakubovich SB, Wimp J. Multidimensional Watson transforms. Internat. J. Math. Statist. Sci.. 1992;1:105-119.Edit