N. J. Magnanti, M. Almeida, and Álvaro L. Mafra, “PERFORMANCE OF NATURAL PHOSPHATE ALVORADA COMPARED TO TRIPLE SUPERPHOSPHATE IN THE INTRODUCTION OF A PERENNIAL WINTER PASTURE”, Rev. Ciênc. Agrovet., vol. 4, no. 2, pp. 133–144, Jun. 2005.