The non-Watson-Crick base pairs and their associated isostericity matrices.

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3DNA: a software package for the analysis, rebuilding and visualization of three-dimensional nucleic acid structures. (2003, background): “This geometrically based algorithm differs from conventional hydrogen bond searches of nucleic acid interactions, which are based on the distances between pre-selected proton donor and acceptor atoms (25,26).”
RNA-Puzzles: a CASP-like evaluation of RNA three-dimensional structure prediction. (2012, background): “Any canonical or noncanonical base-pairing interaction catalogued in Leontis et al. (2002), plus stacking and a ‘‘Superimpose’’ threading force can be enforced between any and all pairs of residues specified by the user.”
Tools for the automatic identification and classification of RNA base pairs (2003, background): “The cis Sugar/Sugar family is dominated by the isosteric A G and G A pairs [some pairs present in the tables of (1) would not appear in the numbers calculated here because of the condition imposed about the presence of at least one H-bond between heavy atoms].”
Replication by human DNA polymerase-ι occurs by Hoogsteen base-pairing (2004, background): “Notably, both dCTP and dTTP can make a single hydrogen bond opposite template G( syn ) at neutral p”
FR3D: finding local and composite recurrent structural motifs in RNA 3D structures (2007, methodology): “according to the 12 basepairing categories of [30].”