TY - JOUR T1 - Monoclinic Double Selenates of the Copper Group JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 98 IS - 689 SP - 67 EP - 95 PY - 1920/10/01/ UR - http://dx.doi.org/10.1098/rspa.1920.0054 M3 - doi:10.1098/rspa.1920.0054 AU - Tutton, A. ER -