Citation: Molchanov, V.N.; Kondakov, A.F.; Maksimov, B.A.; Chernaya, T.S.; Simonov, V.I.; Pisarevskii, Yu.V. (2001). Crystal structure and optical activity of La3 Nb0.5 Ga5.5 O14 and Sr3 Ga2 Ge4 O14 single crystals of the langasite family. Journal of Experimental and Theoretical Physics Letters, 74, pp. 222-225.