  A stability method is used to assess possible values of interspecies
scattering lengths a_12 in two-component Bose-Einstein condensates described
within the Gross-Pitaevskii approximation. The technique, based on a recent
stability analysis of solitonic excitations in two-component Bose-Einstein
condensates, is applied to ninety combinations of atomic alkali pairs with
given singlet and triplet intraspecies scattering lengths as input parameters.
Results obtained for values of a_12 are in a reasonable agreement with the few
ones available in the literature and with those obtained from a Painleve
analysis of the coupled Gross-Pitaevskii equations.
