J. Verkelis, “Fibre-Optic Reflection Nanometric Displacement Measurement Systems Principles of Operating, Construction, Investigation”, ELEKTRON ELEKTROTECH, vol. 22, no. 4, Aug. 1999, Accessed: Feb. 08, 2026. [Online]. Available: https://eejournal.ktu.lt/index.php/elt/article/view/16558