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@article{AIHPA_1985__43_2_181_0, author = {Davies, E. B.}, title = {Criteria for ultracontractivity}, journal = {Annales de l'I.H.P. Physique th\'eorique}, pages = {181--194}, publisher = {Gauthier-Villars}, volume = {43}, number = {2}, year = {1985}, mrnumber = {817534}, zbl = {0589.35030}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AIHPA_1985__43_2_181_0/} }
Davies, E. B. Criteria for ultracontractivity. Annales de l'I.H.P. Physique théorique, Tome 43 (1985) no. 2, pp. 181-194. http://geodesic.mathdoc.fr/item/AIHPA_1985__43_2_181_0/