%0 Journal Article %T A spectral problem with an indefinite weight for an elliptic system %A Mamadou Sango %J Electronic Journal of Differential Equations %D 1997 %I Texas State University %X We establish the completeness and the summability in the sense of Abel-Lidskij of the root vectors of a non-selfadjoint elliptic problem with an indefinite weight matrix and the angular distribution of its eigenvalues. %K indefinite weight %K completeness %K summability %K root vectors. %U http://ejde.math.txstate.edu/Volumes/1997/21/abstr.html