Liu AY, Van der Ploeg LH, Rijsewijk FA, Borst P (June 1983). „The transposition unit of variant surface glycoprotein gene 118 of Trypanosoma brucei. Presence of repeated elements at its border and absence of promoter-associated sequences”. Journal of Molecular Biology167 (1): 57–75. DOI:10.1016/S0022-2836(83)80034-5. PMID6306255.
Liu AY, Van der Ploeg LH, Rijsewijk FA, Borst P (June 1983). „The transposition unit of variant surface glycoprotein gene 118 of Trypanosoma brucei. Presence of repeated elements at its border and absence of promoter-associated sequences”. Journal of Molecular Biology167 (1): 57–75. DOI:10.1016/S0022-2836(83)80034-5. PMID6306255.