@article{BSMF_1974__102__109_0,
     author = {Ton-That Long},
     title = {Semi-groupes de contractions de classe $C_0$ de l{\textquoteright}espace de {Hilbert}},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {109--127},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {102},
     year = {1974},
     doi = {10.24033/bsmf.1773},
     mrnumber = {50 #14361},
     zbl = {0303.47009},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1773/}
}