@article{AFST_1996_6_5_1_105_0,
     author = {Gaultier, Maurice and Lezaun, Mikel},
     title = {Spectral study of a self-adjoint operator on $L^2 (\Omega )$ related with a {Poincar\'e} type constant},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {105--123},
     publisher = {Universit\'e Paul Sabatier},
     address = {Toulouse},
     volume = {Ser. 6, 5},
     number = {1},
     year = {1996},
     zbl = {0869.35066},
     language = {en},
     url = {http://archive.numdam.org/item/AFST_1996_6_5_1_105_0/}
}