Spalevic, P., L. Spalevic, B. Milosevic, and I. Petrovic. “The Influence of Phase Shift of Interference on Signal Propagation Along the Optical Fiber”. Elektronika Ir Elektrotechnika, vol. 74, no. 2, Feb. 2007, pp. 25-28, https://eejournal.ktu.lt/index.php/elt/article/view/10356.