AIP Conference Proceedings - Volume 3274: TechSys2024

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