Sinadinovski, Lj. Petkovski, M. Ristov, G. “A METHOD FOR DIRECT MEASUREMENT OF THE PICK VALUE A. C. VOLTAGE (in Macedonian)”. Matematichki Bilten, vol. 17, no. 1, Jan. 1967, https://bilten.smm.org.mk/index.php/bilten/article/view/1299.