The role of heat effects in the process of formation of color centers in LiF during filamentation of femtosecond laser pulsesA.V. Kuznetsov, V.P. Dresvyansky, O. Bukhtsoozh, S. Enkhbat and E.F. MartynovichEPJ Web Conf., 220 (2019) 02007DOI: https://doi.org/10.1051/epjconf/201922002007