@article{CMH_1981__56_139859,
     author = {Francois Sigrist and J.-M. Lemaire},
     title = {Sur les invariants d'homotopie rationnelle li\'es \`a la {L.S.} cat\'egorie.},
     journal = {Commentarii mathematici Helvetici},
     pages = {103--122},
     publisher = {mathdoc},
     volume = {56},
     year = {1981},
     zbl = {0479.55008},
     url = {http://geodesic.mathdoc.fr/item/CMH_1981__56_139859/}
}