Resistance to experimental infections with Haemonchus contortus in Romanov sheep G. Luffau, J. Vu Tien Khang, J. Bouix, TC Nguyen, P. Cullen, G. Ricordeau, C. Carrat and F. Eychenne Genet. Sel. Evol., 22 2 (1990) 205-229 DOI: 10.1051/gse:19900205