1. Uber die vierdimensionalen Gruppen des dreidimensionalen Raumes;Heesch;Z. Kristallogr.,1930
2. Simmetriya i antisimmetriya konechnykh figur;Shubnikov,1951
3. Shubnikov groups;Belov;Kristallografiya,1957
4. Electrodynamics of soilds;Landau,1957
5. Magnetic symmetry of crystals;Tavger;Soviet Phys. JETP,1956