1. Die technische Physik der elektrischen Kontakte;Holm,1946
2. Electrical Contacts;Windred,1940
3. Effect of contact opening speed on arc energy in a.c. switching;Eskin;Gen. Elec. Rev.,1939
4. Contactslijtage;Diehl;Electrotechniek,1946
5. Mechanische slijtage van contactstukken;Diehl;Elektrotechniek,1950