Papers in journals
R. Popa - Toward EHW 2.0 - Some Ideas in HDL-Based Evolution of Digital Circuits, Global Journal of Technology and Optimization, vol. 6, issue 2, 2015, an open acces journal: http://dx.doi.org/10.4172/2229-8711.1000174 (ISSN: 2229-8711).
V. Nicolau, R. Popa, C. Miholca, - Spectral Density Correction of a Signal at Frequency Variable Transformation, The Annals of "Dunarea de Jos" University of Galati, fascicle III, 2006, pp. 43-48 (ISSN 1221-454X).
D. Aiordachioaie, H. Peremans, V. Nicolau, R. Popa - A Visualization Toolkit Approach with Tcl scripts for 3D Modelling and Object Visualization in Computed Tomography, Buletinul Institutului Politehnic din Iasi, Tome LI(LV), Fasc. 1-4, 2005, pp. 17-28
R. Popa -
V. Nicolau, Gh. Puscasu, R. Popa - Properties of Potential Function-Based Clustering Algorithms, The Annals of "Dunarea de Jos" University of Galati, fascicle III, 2000, pp. 30-35 (ISSN 1221-454X).
D. Aiordachioaie, R. Popa, M. Culea - On Process Modelling Using Physical Oriented and Phenomena Based Principles, The Annals of "Dunarea de Jos" University of Galati, fascicle III, 2000, pp. 24-29 (ISSN 1221-454X).
R. Popa - Evolutionary Design of Digital Circuits - An Alternate Approach to the Conventional Logic Design, The Annals of "Dunarea de Jos" University of Galati, fascicle III, 1999, pp. 10-13 (ISSN 1221-454X).
R. Popa, C. Cruceru, M. Iliev - A Genetic Algorithm for the Fault Coverage Code Generation Problem, The Annals of "Dunarea de Jos" University of Galati, fascicle III, 1998, pp. 111-115 (ISSN 1221-454X).
R. Popa, C. Cruceru, M. Iliev - Uncertainty in Testing of Open Circuit Supply Faults in CMOS Logic Circuits, The Annals of "Dunarea de Jos" University of Galati, fascicle III, 1996, pp. 44-47 (ISSN 1221-454X).
R. Popa, I. Cornei - A Method for Acquisition and Processing of Electrophysiological Signals on Computer. The Case of ECG Signal, The Annals of "Dunarea de Jos" University of Galati, fascicle III, 1996, pp. 62-66 (ISSN 1221-454X).
M. Iliev, C. Cruceru, R. Popa - Three-phase, square-wave inverter with NMOS Transistors, The Annals of "Dunarea de Jos" University of Galati, fascicle III, 1996, pp. 98-102 (ISSN 1221-454X).
R. Popa, S. Cruceanu - Microprocesoarele si automatizarea navala , Buletin de informare tehnica navala, BITNAV, nr. 3/1986, pp. 198-199