@article{10_4064_sm_33_1_13_18,
     author = {J. Chrabowski and G. {\L}ubczonok},
     title = {Sur les semi-groupes \`a n param\`etres des op\'erateurs lin\'eaires},
     journal = {Studia Mathematica},
     pages = {13--18},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1969},
     doi = {10.4064/sm-33-1-13-18},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-33-1-13-18/}
}