Claire N. Harrison, Peter J. Campbell, Georgina Buck, Keith Wheatley, Clare L. East: Hydroxyurea Compared with Anagrelide in High-Risk Essential Thrombocythemia. In: New England Journal of Medicine. Band353, Nr.1, 7. Juli 2005, S.33–45, doi:10.1056/NEJMoa043800, PMID 16000354.
Claire N. Harrison, Peter J. Campbell, Georgina Buck, Keith Wheatley, Clare L. East: Hydroxyurea Compared with Anagrelide in High-Risk Essential Thrombocythemia. In: New England Journal of Medicine. Band353, Nr.1, 7. Juli 2005, S.33–45, doi:10.1056/NEJMoa043800, PMID 16000354.