@article{EXMATH_1997_1997_1_a6,
     author = {Bustamante Gonz\'alez, Jorge and Escobedo Conde, Ra\'ul},
     title = {{\textquestiondown}Cu\'ando es tonelada un \'algebra de composici\'on?},
     journal = {Extracta mathematicae},
     pages = {19-23},
     year = {1997},
     volume = {12},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1997_1997_1_a6/}
}