Ribeiro, E. L. de A., Figueiró, P. R. P. and Rocha, M. A. da (1991) “Production and characteristics of wool from sheep of undefined pedigree in the region of Londrina - State of Paraná”, Semina: Ciências Agrárias, 12(1), pp. 21–25. doi: 10.5433/1679-0359.1991v12n1p21.