Convexification of functions by nonlinear coordinate transformations. ( Working paper of the Laboratory of Operations Research and Decision Systems, (LORDS) WP 99-9.)
Global Lagrange multiplier rule and smooth exact penalty functions for equality constraints. I(Working paper of the Laboratory of Operations Research and Decision Systems, (LORDS) WP 99-5.)
Mechanikai egyensúly és egyensúlyi rendszerek. (Equilibrium in mechanics and equlibrium systems.) (in Hungarian) (Working paper of the Laboratory of Operations Research and Decision Systems, (LORDS) WP 99-7.)