1. Ueber die Natur der Farbzentren in Alkalihalogenid-Kristallen
2. Solid State Physics;Markham,1966
3. The Physics of Colour Centres;Fowler,1968
4. The Physics of Colour Centres;Seidel,1968
5. The Structures and Properties of Solids 1: Defects in Crystalline Solids;Henderson,1972