Asprelli, P. D., Anido, F. S. L. and Cointry, E. L. (2005) “Agronomic characters in asparagus of different ages and crop systems”, Pesquisa Agropecuaria Brasileira, 40(1), pp. 47–52. doi: 10.1590/S1678-3921.pab2005.v40.6920.