Guillaumes, E., and J.M. Villar. 2004. “Effects of DMPP [3,4-Dimethylpyrozole Phosphate] on the Growth and Chemical Composition of Ryegrass (Lolium Perenne L.) Raised on Calcareous Soil”. Spanish Journal of Agricultural Research 2 (4), 588-96. https://doi.org/10.5424/sjar/2004024-115.