@article{RSMUP_2006__115__85_0,
     author = {Brandl, Rolf and Corsi Tani, Gabriella and Serena, Luigi},
     title = {The {Birkhoff-Neumann} {Embedding} of {Relatively} {Free} {Groups}},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {85--97},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {115},
     year = {2006},
     mrnumber = {2245589},
     zbl = {1119.20028},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_2006__115__85_0/}
}