1. G. Petruzzelli, L. Lubrano, G. Guidi. 1985. Heavy metal extractability. Biocycle, 26: 46–49.
2. G. Giovannini, S. Lucchesi, M. Giachetti, G. Petruzzelli. 1990. Thermal clean-up of contaminated soil: the effect on soil characteristics Hazardous Waste Management, Contaminated Sites and Industrial Risk Assessment. Vienna pp. 189–198.