AIP Conference Proceedings - Volume 3078: TechSys2023

AIP Conference Proceedings - Volume 2980: TechSys2022 

AIP Conference Proceedings - Volume 2449: TechSys2021

IOP Conference Series: Materials Science and Engineering, vol 878: Techsys 2020
Fundamental Sciences and Applications, 
JOURNAL OF THE TECHNICAL UNIVERSITY - SOFIA, PLOVDIV BRANCH: Techsys 2020

IOP Conference Series: Materials Science and Engineering, vol 618: Techsys 2019
Fundamental Sciences and Applications,
JOURNAL OF THE TECHNICAL UNIVERSITY - SOFIA, PLOVDIV BRANCH: Techsys 2019
Proceedings: Techsys 2019

Proceedings: Techsys 2018 

Proceedings: Techsys 2017

Proceedings: Techsys 2016