@incollection{JEDP_2000____A13_0,
     author = {Helffer, Bernard and Ramond, Thierry},
     title = {Semiclassical expansion for the thermodynamic limit of the ground state energy of {Kac's} operator},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {13},
     pages = {1--17},
     publisher = {Universit\'e de Nantes},
     year = {2000},
     mrnumber = {2001i:81087},
     zbl = {01808703},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_2000____A13_0/}
}