Markovska, I. , Zaicev, N. , Bogdanov, B. , Georgiev, D. , Hristov, Y. (2011). 'Design of Laboratory Pilot Reactor for Filtering and Separation of Water – oil Emulsions'. World Academy of Science, Engineering and Technology, Open Science Index 59, International Journal of Chemical and Molecular Engineering, 5(11), 949 - 952.