1. Twinning on the unit cell level as a structure-building operation in the solid state
2. 2) Bailey, S. W. (1980) Crystal Chemistry of True Micas. In Bailey, S. W. (Ed.) Reviews in Mineralogy, vol. 13, Mineralogical Society of America, 13–57.
3. 4) Belov, N. V. (1947) The twin laws of micas and micaceous minerals. Mineralog. sb. L’vovsk. geol. obva pri. univ., 3, 29–40 (in Russian).