1] Assoc. Prof., PhD Svilen Rachev STUDY OF THE ENERGY POTENTIAL OF RENEWABLE ENERGY SOURCES IN THE REGION OF GABROVO FOR USE IN HYBRID WIND-PHOTOVOLTAIC STAND-ALONE SYSTEM" - Contemporary Materials 2015 - Савремени Материјали, 15.07.2015.
(https://ekonferencije.com/sr/rad/study-of-the-energy-potential-/4053)

2] Assoc. Prof., PhD Svilen Rachev ANALYSYS OF THE PERFORMANCE OF SMALL WIND TURBINES DARIUS AND OPTIONS FOR THEIR INTEGRATION IN BUILDINGS" - Contemporary Materials 2015 - Савремени Материјали, 15.07.2015.
(https://ekonferencije.com/sr/rad/analysys-of-the-performance-of/4051)

3] Assoc. Prof., PhD Svilen Rachev ELECTRIC DRIVE OF TWO-AXES TRACKING SYSTEM FOR PHOTO-VOLTAIC MODULES" - Contemporary Materials - 2013 - Savremeni materijali , 07.06.2013.
(https://ekonferencije.com/sr/rad/electric-drive-of-two-axes-tra/2315)