@article{10_4064_cm_20_2_181_187,
     author = {David M. Clark},
     title = {Varieties with isomorphic free algebras},
     journal = {Colloquium Mathematicum},
     pages = {181--187},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1969},
     doi = {10.4064/cm-20-2-181-187},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-20-2-181-187/}
}