@incollection{AST_1995__232__187_0,
     author = {Popa, Sorin},
     title = {Free-independent sequences in type $II_1$ factors and related problems},
     booktitle = {Recent advances in operator algebras - Orl\'eans, 1992},
     series = {Ast\'erisque},
     pages = {187--202},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {232},
     year = {1995},
     mrnumber = {1372533},
     zbl = {0840.46039},
     language = {en},
     url = {http://www.numdam.org/item/AST_1995__232__187_0/}
}