Otero E.E. Spatial and temporal patterns of water quality indicators in reef systems of southwestern Puerto Rico. Carribbean journal of science, Vol 45, Is 2-3, 2009, pp. 168-180
Todd B., Ballentine D.L., Otero E. Nutrient distribution across the insular shelf of La Parquera, Puerto Rico: assessment by algal tissue nitrogen. Caribbean Journal of Science, Vol 45, No 2-3, 181-190, 2009.