D. Brownawell, `Bounds for the degress in the Nullstellensatz'
Annals of Mathematics, 126, 1987, 577-591.


F. Beukers, D. Brownawell, and G. Heckman, `Siegel normality',
Annals of Mathematics, 127, 1987, 279-308.


D. Brownawell and D. Masser, `Multiplicity estimates for analytic functions,'
J. reine angew. Math., 314, 1980, 200-216.