Geometry and topology of best and near-best approximation, Journal of Approximation Theory, 105 (2000) 252-262 (co-authors: Vera Kurkova and Andrew Vogt).
Approximation by neural networks is not continuous, Neurocomputing 29 (1999) 45-56 (co-authors: Vera Kurkova and Andrew Vogt).
An integral formula for Heaviside neural networks, Neural Network World 10 (3) (2000) 313-319 (co-authors: Vera Kurkova and Andrew Vogt).
Continuity of approximation by neural networks in L^p spaces, Annals of Operations Research, to appear (co-authors: Vera Kurkova and Andrew Vogt).
Best approximation by Heaviside perceptron networks, Neural Networks 13(7) (2000) 695-697. (co-authors: Vera Kurkova and Andrew Vogt). postscript or LaTeX .
Convexity and nonlinear approximation
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Isolated squares in hypercubes and robustness of commutativity, Cahiers Topologie Geom. Differentielle Categ., to appear. postscript ; this is related to the paper on robust cycle bases mentioned above.