Non-Traditional and Advanced Machining TechnologiesHelmi Youssef, Hassan El-Hofy · First published 2020Open the Tome
Machining of Stainless Steels and Super AlloysHelmi A. A. Youssef · First published 2015 · Latest edition 2016Open the Tome
Herstellgenauigkeit beim Stossläppen mit UltraschallfrequenzHelmi Abdel-Maksoud Awad Youssef · First published 1967Open the Tome