Amaral Sobrinho, N.M.B., Febles Gonz?lez, J.M., L?pez, Y.P., Guedes, J.N., Magalh?es, M.O.L. and Zoffoli, H.J.O. 2013. Natural content of heavy metals on cattle regions soils of Mayabeque and Artemisa province in Cuba. Cuban Journal of Agricultural Science. 47, 2 (Jun. 2013).