@article{CMH_1989__64_1_140159,
     author = {Gilles Courtois and Bruno Colbois},
     title = {Les valeurs propres inf\'erieures \`a 1/4 des surfaces de {Riemann} de petit rayon d'injectivit\'e.},
     journal = {Commentarii mathematici Helvetici},
     pages = {349--362},
     publisher = {mathdoc},
     volume = {64},
     number = {1},
     year = {1989},
     zbl = {0684.53040},
     url = {http://geodesic.mathdoc.fr/item/CMH_1989__64_1_140159/}
}