Local-Field Effects in the Zero-Phonon Spectral Lines of Single Impurity Molecules in Solid Matrices at Low TemperaturesT.A. Anikushina, M.G. Gladush, A.A. Gorshelev and A.V. NaumovEPJ Web of Conferences, 103 (2015) 05001DOI: https://doi.org/10.1051/epjconf/201510305001