@article{MM2_1990__68_2_155520,
     author = {Gilles Courtois and Bruno Colbois},
     title = {A {Note} on the {First} {Nonzero} {Eigenvalue} of the {Laplacian} {Acting} of {P-Forms.}},
     journal = {Manuscripta mathematica},
     pages = {143--160},
     publisher = {mathdoc},
     volume = {68},
     number = {2},
     year = {1990},
     zbl = {0709.53031},
     url = {http://geodesic.mathdoc.fr/item/MM2_1990__68_2_155520/}
}