Gabriel Filho, L. R. A., et al. “MATHEMATICAL MODELS OF A REQUIRED POWER DESIGN FOR IRRIGATION WITH SMALL-SIZED ELECTRIC MOTORS”. Revista Brasileira De Engenharia De Biossistemas, vol. 9, no. 2, June 2015, pp. 99-108, doi:10.18011/bioeng2015v9n2p99-108.