R. Popa, M. Iliev, V. Nicolau - Evolutionary Systems for Electronic Engineers , Interdisciplinarity in Engineering. Proceedings of the Scientific Conference INTER-ING 2003, Tg. Mures, Romania, 6-7 November, 2003, vol.2, pp. 187-192 (ISBN 973-8084-83-0)

R. Popa - Proiectarea evolutiva a circuitelor numerice, Sesiunea Nationala de Comunicari Stiintifice organizata de Academia Fortelor Aeriene "Henri Coanda" si Centrul Regional pentru Managementul Resurselor de Aparare, Brasov, Romania, 1-2 noiembrie, 2002, pp. 35-44

M. Iliev, R. Popa - The Filtering of Noisy Measurement Data Using Fuzzy Operators, The 11-th National Conference on Electric Drives, CNAE 2002, Galati, Romania, 10-12 October, 2002, pp. 152-157

R. Popa, M. Iliev - Self-adaptation and Self-repair in Evolvable Hardware, The 10-th Symposium on Modelling, Simulation and Identification Systems, SIMSIS 10'98, Galati, Romania, 22-23 October 1998, pp. 259-263

R. Popa, C. Cruceru, M. Iliev - A Hybrid Genetic Algorithm for Automatic Test Pattern Generation, The 10-th Symposium on Modelling, Simulation and Identification Systems, SIMSIS 10'98, Galati, Romania, 22-23 October 1998, pp. 74-78

R. Popa, I. Cornei - Equipment for Acquisition and Processing of ECG Signals on Computer, The 9-th Symposium on Modelling, Simulation and Identification Systems, SIMSIS 9'96, Galati, Romania, 24-25 October 1996, pp. 348-352

T. Munteanu, R. Popa, M. Dumitrescu - Metoda de masurare a energiei disipate în dielectrici în timpul descarcarilor partiale, Al II-lea Colocviu de Analiza, Proiectare, Conducere Automata in Sistemele Electrice, Galati, Romania, 28-29 octombrie, 1993, pp. 197-200

Gh. Puscasu, R. Popa, V. Palade - Modalitati de depanare a sistemelor cu microprocesor, Simpozionul de modelare, simulare si identificare a sistemelor SIMSIS 7'92, Galati, Romania, octombrie 1992, pp. 445-450