A Lagrange multiplier theorem and a sandwich theorem for convex relations. J.M. Borwein — 1981 Mathematica Scandinavica
Tangent cones, starshape and convexity. Borwein, J.M. — 1978 International Journal of Mathematics and Mathematical Sciences
Evaluations of k -fold Euler/Zagier sums: a compendium of results for arbitrary k . Borwein, J.M.; Bradley, D.M.; Broadhurst, D.J. — 1997 The Electronic Journal of Combinatorics [electronic only]