1. Fierro-Benitez R., De Groot L.J., Parades M., Penafiel W. Yodo, bocio y cretinismo endemicos en la region andina del Ecuador. Rev. Ecuat. Med. Cienc. Biol. 5: 15, 1967.
2. Fierro-Benitez R., Penafiel W., De Groot L.J., Ramirez I. Endemic goiter and endemic cretinism in the Andean region. N. Engl. J. Med. 280: 296, 1969.
3. Fierro-Benitez R., Stanbury J.B. The effectiveness of iodized oil in goiter prevention in rural Ecuador. Western Hemisphere Nutrition Congress II. AMA, San Juan de Puerto Rico, 1968, p. 58.
4. Fierro-Benitez R., Ramirez I., Estrella E., Jaramillo C., Diaz C., Urresta J. Iodized oil in the prevention of endemic goiter and associated defects in the Andean region of Ecuador. I. Program design, effects on goiter prevalence, thyroid function and iodine excretion. In: Stanbury, J.B. (Ed.), Endemic goiter. Scientific publication No. 193, PAHO, Washington, D.C., 1969, P. 306.
5. Kevany J., Fierro-Benitez R., Pretell E., Stanbury J.B. Prophylaxis and treatment of endemic goiter with iodized oil in rural Ecuador and Peru. Am. J. Clin. Nutr. 22: 1597, 1969.