@article{ASENS_2000_4_33_5_611_0,
     author = {Colbois, Bruno and Courtois, Gilles},
     title = {Petites valeurs propres et classe {d{\textquoteright}Euler} des $S1-$ fibr\'es},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {611--645},
     publisher = {Elsevier},
     volume = {4e s{\'e}rie, 33},
     number = {5},
     year = {2000},
     doi = {10.1016/s0012-9593(00)01048-x},
     zbl = {0968.58001},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.1016/s0012-9593(00)01048-x/}
}