. "DK" . "Acta Crystallogr.,Sect.D" . "ABCRE6" . "0766" . "0907-4449" . "52" . "655" . "667" . "10.1107/S0907444996000248" . . "Structure of the purine-pyrimidine alternating RNA double helix, r(GUAUAUA)d(C), with a 3'-terminal deoxy residue." . . . . . .