1. Dampfturbinen;Scarlin;BWK,1997
2. Gasturbinen;Perkavec;BWK,1997
3. N. Kolev, D. Kolev, N. Filipova, A method and an installation with a gas–steam turbine for heat utilization at burning of gaseous and liquid fuels, PCT/Bg 98/00004
4. Systems containing contact economizers for flue gas heat utilization;Kolev,1992
5. R.C. Reid, J.M. Prausniz, T.K. Sherwood, The Properties of Gases and Liquids, 3rd ed., McGraw-Hill, New York