Terms sourced from: http://iupac.org/publications/pac/68/6/1321/

"A new approach to enhancing the efficiency and specificity of interaction in duplexes by the use of tandem structure", Pyshnyi, D.V.;Pyshnaya, I.A.;Lokhov, S.G.;Podyminogin, M.A.;Ivanova, E.M.;Zarytova, V.F., Pure and Applied Chemistry 1996, 68(6), 1321