Walsh KJ, Al-Quran SZ, Li Y, Braylan RC, Lynch JW. Discordant expression of CD20 by flow cytometry and immunohistochemistry in a patient responding to rituximab: an unusual mechanism. Clin Lymphoma Myeloma. 2007 Jan;7(4):319–22. doi: 10.3816/clm.2007.n.010. PMID: 17324342.