no. 2
Criteria for ultracontractivity
Annales de l'I.H.P. Physique théorique, Tome 43 (1985) no. 2, pp. 181-194. 
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     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://www.numdam.org/item/AIHPA_1985__43_2_181_0/}
}
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Davies, E. B. Criteria for ultracontractivity. Annales de l'I.H.P. Physique théorique, Tome 43 (1985) no. 2, pp. 181-194. http://www.numdam.org/item/AIHPA_1985__43_2_181_0/

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