Lykova, O. B., K. R. Schneider, and S. V. Yanchuk. “Amplitude Synchronization in a System of Two Coupled Semiconductor Lasers”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 60, no. 3, Mar. 2008, pp. 426–435, https://umj.imath.kiev.ua/index.php/umj/article/view/3165.