Technical and technological investigation of cultural heritage: experience in applications of spectroscopic methodsI.A. Grigorieva, K.S. Chugunova, I.F. Kadikova, S.V. Khavrin and S.A. PisarevaEPJ Web Conf., 132 (2017) 01006DOI: https://doi.org/10.1051/epjconf/201713201006