@article{10_4064_cm_79_1_119_131,
     author = {M. Barot and J. de la Pe\~na},
     title = {Algebras whose {Euler} form is non-negative},
     journal = {Colloquium Mathematicum},
     pages = {119--131},
     publisher = {mathdoc},
     volume = {79},
     number = {1},
     year = {1999},
     doi = {10.4064/cm-79-1-119-131},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-79-1-119-131/}
}