%0 Journal Article %A O.A. Laudal %A A. Sletsjoe %T Betti numbers of monoid algebras. Applications to 2-dimensional torus imbeddings. %J Mathematica Scandinavica %D 1985 %P 145-162 %V 56 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1985__56_166930/ %F MS2_1985__56_166930