High temperature conductivity and F-centres in ZnSLott, Kalju; Varvas, JüriPhysica status solidi. B, Basic solid state physics1973 / [?]https://www.ester.ee/record=b1198778*est
Stability of F-centres in additively coloured ZnS crystals at low temperaturesLott, KaljuPhysica status solidi. B, Basic solid state physics1972 / K43-K44https://www.ester.ee/record=b1198778*est