1. Commercial crossing with Dobruja Finewool ewes and Clun Forest or Mutton Merino rams;Tomov;Zhivot. Nauk.,1967
2. The effectiveness of fattening Suffolk-Tsigai ram lambs;Rodin;Ovtsevodstvo,1964
3. The growth and development of crossbreds obtained by crossing Suffolk rams with Tsigai ewes;Polskaja;Zhivotnovodstvo, Mosk,1966
4. Morphological and physiological characters of the Figeneration of Hampshire × Tsigai and Shropshire × Tsigai sheep;Kosanović;Stočarstvo,1963
5. Breeding value of ewes used for commercial crossing with different breeds of ram;Desvignes;Bull. tech. Ing. Serv. agric.,1964