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
Mordin M, Anastassopoulos K, van Breda A, Vallow S, Zhang M, Gargiulo K, Hewitt D, Olson W, Sikirica V. Clinical staff resource use with intravenous patient-controlled analgesia in acute postoperative pain management: results from a multicenter, prospective, observational study. J Perianesth Nurs. 2007 Aug 1;22(4):243-55.
Grubb NR, Sutherland GR, Fleming A, Campanella C, Fox KAA, Sinclair C. Doppler tissue imaging for non-invasive optimisation of graft functions after dynamic cardiomyoplasty. Poster presented at the Medical Research Society Communications Meeting; April 13, 1994. [abstract] Clin Sci (Lond). 1994 Dec 1; 87(s31):38. doi: 10.1042/cs045038P_pt2