Deformations in round-profiled threads and their influence on the screw durabilityPenkov, Igor; Strižak, Viktor; Sivitski, AlinaInternational review of mechanical engineering (IREME)2007 / 4, p. 372-379 : ill https://www.praiseworthyprize.org/jsm/index.php?journal=irece&page=article&op=view&path%5B%5D=76

Kiud ja niidid : laboratoorsete tööde juhend2001 https://www.ester.ee/record=b1526033*est

Strength investigation of rolled threadsStrižak, Viktor; Penkov, IgorHARDMEKO'98 : proceedings of International Symposium on Advances in Hardness Measurement : September 21-23, 1998, Beijing, China1998 / p. 35-40 : ill

О расчете упругой нити по методу деформацииKulbach, Valdek; Engelbrecht, JüriСтроительные конструкции и строительная физика : сборник статей. 51967 / с. 57-64 : илл https://www.ester.ee/record=b2182183*est https://digikogu.taltech.ee/et/Item/7156140a-c487-49ea-93b9-fa78852d252e