Venturin, N., Nogueira, F. D. and Coqueiro, G. R. (1995) “Effects of the Araxá rock phosphate, calcareous and gypsum on seedlings of rubber tree”, Pesquisa Agropecuaria Brasileira, 30(2), pp. 187–193. doi: 10.1590/S1678-3921.pab1995.v30.4291.