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@article{PORMA_1997__54_3_47898, author = {Joshi, M.S.}, title = {Complex powers of the wave operator.}, journal = {Portugaliae mathematica}, pages = {345--362}, publisher = {mathdoc}, volume = {54}, number = {3}, year = {1997}, zbl = {0891.35166}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1997__54_3_47898/} }
Joshi, M.S. Complex powers of the wave operator.. Portugaliae mathematica, Tome 54 (1997) no. 3, pp. 345-362. http://geodesic.mathdoc.fr/item/PORMA_1997__54_3_47898/