Edwards PET, Parsons GR, Myers KH. The economic value of viewing migratory shorebirds on the Delaware Bay: an application of the single-site travel cost model using on-site data. Hum Dimens Wildl. 2011;16(6):435-44. doi: 10.1080/10871209.2011.608180
Mirabelli MC, Zock JP, Bircher AJ, Jarvis D, Keidel D, Kromhout H, Norbäck D, Olivieri M, Plana E. Metalworking exposures and persistent skin symptoms in the ECRHS II and SAPALDIA 2 cohorts. Contact Dermatitis. 2009 May;60(5):256-63.
Ward A, Caro JJ, Green T, Huybrechts K, Arana A, Wait S, Eleftheriou A. An international survey of patients with thalassemia major and their views about sustaining life-long desferrioxamine use. BMC Clin Pharmacol. 2002;2(3).