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[CaGaHe91] L. Caniglia, A. Galligo, and J. Heintz. Equations for the projective closure and effective nullstellensatz. Discrete Applied Mathematics, 33:11--23, 1991.

[DiFiGiSe91] A. Dickenstein, N. Fitchas, M. Giusti, and C. Sessa. The membership problme for unmixed polynomial ideals is solvable in single exponential time. Discrete Applied Mathematics, 33:73--94, 1991.

[Giusti91] M. Giusti. Complexity of Standard Bases in Projective Dimension Zero II. Proceedings of Applied Algebra, Algebraic Algorithms and Error-Correcting Codes (AAECC '90), LNCS, Vol. 508, pp. 322-328, Springer, August 1991.

[GiHe91] M. Giusti and J. Heintz. Algorithmes - disons rapides - pour la dècomposition d' une variètè algébrique en composantes irrèductibles et èquidimensionelles. In T. Mora and C. Traverso, editors, Proc. MEGA'90, volume 94 of Progress in Mathematics, pages 169--194. Birkhäuser, 1991.

[HeReRo91] J. Heintz, T. Recio, and M.-F. Roy. Algorithms in real algebraic geomety and applications to computational geometry. DIMACS series in Discrete Math. and Theor. Comp. Sci., 6:137--162, 1991.

[MoPaRe91] J. L. Montaña, L. M. Pardo, and T. Recio. The non-scalar model of complexity in computational geometry. Progress in Mathematics 94 , Birkhäuser (1991) 347--361.