Capdevila Bert R, Marsal Mora JR, Pujol Salud J, Anguera Farran R. Prevalence study of iodine deficiency in a 6-year-old school population. An Pediatr (Barc). 2010 May;72(5):331-8. doi: 10.1016/j.anpedi.2009.12.023
Maughan GL, Gnanasakthy A, Cooke DA. The effects of soil-applied granular pesticides on the establishment and yield of sugar-beet in commercial fields. Crop Prot. 1984 Dec;3(4):439-50.
Rothman KJ, Glass RL, Espinal F, Velez H. Caries-free teeth in the absence of fluoride ion. J Public Health Dent. 1972;32(4):225-8. doi: 10.1111/j.1752-7325.1972.tb03977.x