Nitsovych, B. M., I. V. Doctorovych, V. N. Hodovaniouk, V. K. Butenko, and V. H. Yuryev. “Using Photodetectors As Reference Devices to Reduce Measurement Errors”. Technology and Design in Electronic Equipment, no. 3, June 2004, pp. 34-37, https://www.tkea.com.ua/index.php/journal/article/view/TKEA2004.3.34.