Stefanovic, M. C., D. Lj. Draca, and A. S. Panajotovic. 2005. “The Common Influence of Time Shift and Appearing Place of Interference on Signal Propagation Along Optical Fiber”. Elektronika Ir Elektrotechnika 57 (1). https://eejournal.ktu.lt/index.php/elt/article/view/10329.