For Iterated Loop Matching:

[1]   Ruan J, Stormo GD and Zhang W."An Iterated loop matching approach to the prediction of RNA secondary structures with pseudoknots", Bioinformatics. 2004 Jan 1;20(1):58-66.

For Maximum Weighted Matching:

[2]   Tabaska JE, Cary RB, Gabow HN, Stormo GD. "An RNA folding method capable of identifying pseudoknots and base triples", Bioinformatics. 1998;14(8):691-9.

[3]   Cary RB, Stormo GD. "Graph-theoretic approach to RNA modeling using comparative data", Proc Int Conf Intell Syst Mol Biol. 1995;3:75-80.

For this web service:

[4]   Ruan J, Stormo GD and Zhang W."ILM: A Web Server for Predicting RNA secondary structures with Pseudoknots", Submitted.