Berdnikov, Alexey Vladimirovich, Niyaz Azatovich Yunusov, Dmitriy Ivanovich Vorosnin, and Dzgalil Khalilovich Misiev. 2019. “Optical Device for Determining the Viability of Biological Tissue”. Amazonia Investiga 8 (24):193-98. https://amazoniainvestiga.info/index.php/amazonia/article/view/971.