Two-photon absorption of Tl1-xIn1-xSnxSe2 nanocrystallites Galyna Myronchuk, Oleg Parasyuk, Ludmila Piskach, Nasser Saleh Alzayed, Serhii Prokhorenko, Michal Piasecki and Iwan Kityk EPJ Web Conf., 133 (2017) 03001 Published online: 15 December 2016 DOI: 10.1051/epjconf/201713303001