Hello,
I did a literature search as well to find additional references. I used BioMed Central, an open access resource, meaning that every article is available for free for everyone and PubMed, an authoritative source to find scientific articles about health. Every free article has the following note: [FREE]. If you cannot access some articles you need, you can try to get them from your local public library or, maybe, from another colleague from Radical Reference since the access I have at work doesn't allow me to do so.

BioMed Central
Search: "health care" OR "access to care" OR medication* OR "prescription drug" OR "prescription drugs" OR meds (Any word) in Citation and abstract , and prison OR prisoner* OR inmate* OR convict* OR incarcerated (Any word) in Citation and abstract)

Most relevant results:

• [FREE] Changes in health-related quality of life following imprisonment in 92 women in England: a three month follow-up study
  Emma Plugge, Nick Douglas, Ray Fitzpatrick
  International Journal for Equity in Health 2011, 10:21 (25 May 2011)
  Click for article
• [FREE] Medication management and practices in prison for people with mental health problems: a qualitative study
  Robert A Bowen, Anne Rogers, Jennifer Shaw
  International Journal of Mental Health Systems 2009, 3:24 (20 October 2009)
  Click for article
• [FREE] Harm reduction and equity of access to care for French prisoners: a review
  Laurent Michel, M Patrizia Carrieri, Alex Wodak
  Harm Reduction Journal 2008, 5:17 (21 May 2008)
  Click for article

PubMed
Search: ("prisoners"[MeSH Terms] OR "prisoners"[All Fields] OR "prisoner"[All Fields]) AND (access[All Fields] AND ("delivery of health care"[MeSH Terms] OR ("delivery"[All Fields] AND "health"[All Fields] AND "care"[All Fields]) OR "delivery of health care"[All Fields] OR "healthcare"[All Fields]))

Most relevant results:

• [In progress, not available yet] Eur J Health Law. 2013 Mar;20(1):5-19.
  Prisoners right to healthcare, a European perspective.
  Abbing HR.
  Click for abstract
• J Health Care Poor Underserved. 2012 May;23(2):557-69. doi: 10.1353/hpu.2012.0048.
  Health care of pregnant women in U.S. state prisons.
  Ferszt GG, Clarke JG.
  Click for abstract
• [FREE] J Community Health. 2010 Jun;35(3):268-74. doi: 10.1007/s10900-010-9234-9.
  Is incarceration a contributor to health disparities? Access to care of formerly incarcerated adults.
  Kulkarni SP, Baldwin S, Lightstone AS, Gelberg L, Diamant AL.
  Click for abstract and article
• J Correct Health Care. 2009 Oct;15(4):280-91. doi: 10.1177/1078345809340423. Epub 2009 Jul 27.
  Health care policies addressing transgender inmates in prison systems in the United States.
  Brown GR, McDuffie E.
  Click for abstract
• [FREE]Am J Public Health. 2009 Apr;99(4):666-72. doi: 10.2105/AJPH.2008.144279. Epub 2009 Jan 15.
  The health and health care of US prisoners: results of a nationwide survey.
  Wilper AP, Woolhandler S, Boyd JW, Lasser KE, McCormick D, Bor DH, Himmelstein DU.
  Click for abstract and article

Hope it helps!