↑Aden DP, Fogel A, Plotkin S, Damjanov I, Knowles BB: Controlled synthesis of HBsAg in a differentiated human liver carcinoma-derived cell line. In: Nature. Nr.282, Dezember 1979, S.615–616, doi:10.1038/282615a0, PMID 233137, bibcode:1979Natur.282..615A.