Dobrovolskiy, Y. G., V. V. Ryuhtin, I. I. Fedinchuk, and V. G. Yurev. “Symmetric Two-Coordinate Photodiode”. Technology and Design in Electronic Equipment, no. 6, Dec. 2008, pp. 35-37, https://www.tkea.com.ua/index.php/journal/article/view/TKEA2008.6.35.