no. 2
Discreteness of the ground state for non-relativistic bosons in one and two dimensions
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 31 (1979) no. 2, pp. 169-172. 
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     author = {Avron, Yossi and Privman, V.},
     title = {Discreteness of the ground state for non-relativistic bosons in one and two dimensions},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {169--172},
     publisher = {Gauthier-Villars},
     volume = {31},
     number = {2},
     year = {1979},
     mrnumber = {561920},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1979__31_2_169_0/}
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Avron, Yossi; Privman, V. Discreteness of the ground state for non-relativistic bosons in one and two dimensions. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 31 (1979) no. 2, pp. 169-172. http://www.numdam.org/item/AIHPA_1979__31_2_169_0/

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