1] prof Mathias Liewald INFLUENCE OF BLANK HOLDER STIFFNESS ON PART SURFACE QUALITY IN DEEP DRAWING PROCESS" - 12. Međunarodna konferencija o dostignućima elektrotehnike, mašinstva i informatike, 02.03.2015.
(https://ekonferencije.com/sr1/rad/influence-of-blank-holder-stif/2992)

2] prof Mathias Liewald Behavior of Advanced High Strength Steels in Deep Drawing Processes" - DEMI 2013, 14.02.2013.
(https://ekonferencije.com/sr1/rad/behavior-of-advanced-high-stre/1960)