Ballantyne A. Benefits to research subjects in international trials: Do they reduce exploitation or increase undue inducement? Dev W Bioethics 2008; 8: 178-191.

Bentley JP, Thacker PG. The influence of risk and monetary payment on the research participation decision making process. J Med Ethics 2004; 30: 293-298.
CDBI, Working party for the elaboration of a guide for research ethics committee members. Draft guide for research ethics committee members. CDBI; Council of Europe. Strasbourg, 17 November 2008.
Dickert N, Grady C. What’s the price of a research subject? Approaches to payment for research participation. N Eng J Med 1999; 341: 198-203.

Dickert N, Emanuel E, Grady C. Paying research subjects: an analysis of current policies. Ann Int Med 2002: 136: 368-373.

Dunn LB, Gordon NE. Improving informed consent and enhancing recruitment for research by understanding economic behaviour. JAMA 2005; 293: 609-612.

Dunn LB, Kim DS, Fellows IE, Palmer BW. Worth the risk? Relationship of incentives to risk and benefit perceptions and willingness to participate in schizophrenia research. Schizophr Bull 2008: oi:10.1093/schbul/sbn003.

Fry CL, Ritter A, Baldwin S et al. Paying research participants: a study of current practices in Australia. J Med Ethics 2005; 31: 542-547.

Grant RW, Sugarman J. Ethics in human subjects research: do incentives matter? J Med Philos 2004; 29: 717-738.

Grady C. Money for research participation: Does it jeopardize informed consent? Am J Bioeth 2001; 1: 40-44. 

Groves RM, Singer E, Corning A.. Leverage-saliency theory of survey participation – description and an illustration. Public Opinion Quarterly 64; 2000: 299-308.

Halpern SD et al. Hypertensive patients’ willingness to participate in placebo-controlled trials: implications for recruitment efficiency. Am Heart J 2003; 146: 944-945.

Halpern SD, Karlawish JHT, Casarett D et al. Empirical assessment of whether moderate payments are undue or unjust inducements for participation in clinical trials. Arch Intern Med 2004; 164: 801-803.

National Institutes of Health (USA). Guidelines for remuneration of research subjects in the intramural research program and registration in the clinical research volunteer program database. Revised 02/09. www.nihtraining.com/ohsrsite/info/sheet20.html [02.06.2009]

Nurgat ZA et al. Patient motivation surrounding participation in phase I and phase II clinical trials of cancer chemotherapy. Br J Cancer 2005; 92: 1001-1005.

Resnik DB. Research participation and financial inducement. Am J Bioeth 2001; 1: 54-56.

Resnik DB. Increasing the amount of payment to research subjects. J Med Ethics  Journal of Medical Ethics 2008; 34: e14; doi:10.1136/jme.2007.022699

Savulescu J. The fiction of “undue inducement”: why researchers should be allowed to pay participants any amount of money for any reasonable research project. Am J Bioeth 2001; 1: 1-3.

UNAIDS. Ethical considerations in HIV preventive vaccine research. UNAIDS guidance document. http://data.unaids.org/Publications/IRC-pub01/jc072-ethicalcons_en.pdf [25.02.2009].

Wertheimer A, Miller FG. Payment for research participation: a coercive offer? J Med Ethics 2008; 34: 389-392.

Wilkinson M, Moore A. Inducement in research. Bioethics 1997; 11: 373-389