World Models a Case Study on Social Repsonsability. - François Rechenmann; E. Rivera; P. Uvietta (Optimization Techniques, 1975)

A Theoretical Framework for Data-Hiding in Digital and Printed Text Documents. - Renato Villán; Sviatoslav Voloshynovskiy; Frédéric Deguillaume; Yuriy B. Rytsar; Oleksiy J. Koval; Emre Topak; E. Rivera; Thierry Pun (Communications and Multimedia Security, 2005)