Liu AY, Van der Ploeg LH, Rijsewijk FA, Borst P (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 Biology. 167 (1): 57—75. PMID6306255. doi:10.1016/S0022-2836(83)80034-5.
Liu AY, Van der Ploeg LH, Rijsewijk FA, Borst P (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 Biology. 167 (1): 57—75. PMID6306255. doi:10.1016/S0022-2836(83)80034-5.