1. Survey of herbicide residues in soil and wells in three citrus orchards in Valencia, Spain
2. D. Gómez de Barreda, M. Gamon, E. Lorenzo, A. Saez, J. Garcı́a de la Cuadra, C. Ramos, I. Perez, Actas del Congreso de Análisis y Evolución de la Contaminación de las Aguas Subterráneas, Alcalá de Henares, February 1994, Vol. 1, pp. 351–362.
3. D. Gómez de Barreda, E. Lorenzo, A. del Busto, C. Ramos, J. Piquer, A. Lidon, D. Gómez de Barreda Jr., M. Gamon, A. Saez, J. Garcı́a de la Cuadra, A. Ten, C. Peris, Proceedings of the Florida State Horticultural Society, 109, 1996, paper No. 14.
4. Ph. Debongnie, Y. van Elsen, V. Vanderheyden, L. Pussemier, Proceedings of the COST 66 Workshop on Pesticides in soil and the Environment, Stratford-Upon-Avon, May 1996, p. 260.
5. J. Hollis, C. Brown in: A. del Re, E. Capri, S.P. Evans, P. Natali, M. Trevisan (Eds.), Proceedings of the 9th Symposium of Pesticides on Mobility and Degradation of Xenobiotics, Piazenza, October 1993, p. 832.