1. Walsh G. Biopharmaceuticals: recent approvals and likely directions. Trends Biotechnol. 2005;23(11):553–8.
2. Walsh G. Post-translational modifications of protein biopharmaceuticals. Drug Discov Today. 2010;15(17–18):773–80.
3. Rader RA. What is a biopharmaceutical? Part 1: (Bio)technology-based definitions. BioExecutive International; 2005. pp. 60–5.
4. No authors. Federal register/ Vol. 68, No. 123/ Thursday, June 26, 2003/ Notices.
http://www.fda.gov/ohrms/dockets/98fr/03–16108.pdf
. Accessed 19 March 2013.
5. No authors. Federal Register/ Vol. 70, No. 56/ Thursday, March 24, 2005/ rules and regulations.
http://www.gpo.gov/fdsys/pkg/FR-2005-03-24/pdf/05-5780.pdf
. Accessed 19 March 2013.