1. Experiments and Theories on the Power Factor of Glasses as a Function of Composition: II;Stevels;Verres Refractories,1951
2. Electrical Conductivity of Simple Mixed-Alkali Glasses;Lengyel;Glastech. Ber.,1940
3. Elastic Relaxation Behavior of Single Mixed-Alkali Silicates and Borates;Rötger;ibid.,1958