J. Restle, V. A. Polli, and D. B. de Senna, “Breed and heterosis effect on age and weight at puberty and reproductive performance of beef heifers”, PAB, vol. 34, no. 4, pp. 701–707, Apr. 1999, doi: 10.1590/S1678-3921.pab1999.v34.5219.