@article{10_4064_cm_72_1_1_8,
     author = {P. Cohn},
     title = {The universal skew field of fractions ofa tensor product of free rings},
     journal = {Colloquium Mathematicum},
     pages = {1--8},
     publisher = {mathdoc},
     volume = {72},
     number = {1},
     year = {1997},
     doi = {10.4064/cm-72-1-1-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-72-1-1-8/}
}