1. Chen, X.B., 1989. Excretion of purine derivatives by sheep, cattle, its use for the estimation of absorbed microbial protein. Ph.D. Dissertation. University of Aberdeen, Aberdeen, UK.
2. Excretion of purine derivaties by ruminants effect of exogenous nucleic acid supply on purine derivative excretion by sheep;Chen;Br. J. Nutr.,1990
3. Composition, antimicrobial activity of essential oil of Cistus creticus subsp. eriocephalus;Demetzos;Planta Med.,1997
4. Genstat 5 Committee, 1987. Genstat 5 Users’ Manual. Oxford University Press, Oxford, UK.
5. Fernandez, M., Serrano, E., Frutos, P., Giraldez, F.J., Mantecon, A.R., Llach, J.R., 1997. Efecto del aditivo CRINA HC sobre la actividad degradativa ruminal en la especie ovina [Effect of Crina HC supplement upon the rumen degradative activity in sheep]. ITEA 18 (vol. extra) 160–162.