HANDT, H., R. FERNÁNDEZ, Z. BENZO, C. GOMÉZ, E. MARCANO, F. GALÁRRAGA, and R. GONZÁLEZ. 2009. “Operational Speciation of Cd, Cr, Cu, Mn, Ni, Pb, V and Zn in Dust Samples from Schools in Caracas, Venezuela”. Atmósfera 21 (4). https://www.revistascca.unam.mx/atm/index.php/atm/article/view/8609.