A. Schöbel, N. Stoytechva, I. Bakalski, B. Minchev, J. Karner:
"Wayside Train Monitoring Systems at Bulgarian Infrastructure Manager (NRIC) - A Report on Experiencees made in Zimnitsa";
Mechanics Transport Communications, 10 (2012), 3; 110 - 118.
Project Head Norbert Ostermann:
Bedarfserhebung von Checkpoints für NRIC (KE 2008 offen)