August-Jörg, B., R. Hermann, M. Weitz, and E. Renner. “Twenty-Four Vs. Fourty-Eight Weeks of Re-Therapy With Interferon Alpha 2b and Ribavirin in Interferon Alpha Monotherapy Relapsers With Chronic Hepatitis C”. Swiss Medical Weekly, vol. 133, no. 3334, Aug. 2003, pp. 455-60, doi:10.4414/smw.2003.10300.