Structural and optical properties of NdxGd1−xCr3(BO3)4 solid solutionsE.A. Dobretsova, K.N. Boldyrev, E.Yu. Borovikova and V.A. ChernyshevEPJ Web Conf., 132 (2017) 03012DOI: https://doi.org/10.1051/epjconf/201713203012