A couple jumping PCR refs: Paabo S, Irwin DM, Wilson AC. "DNA Damgae promotes jumping between templates during enzymatic amplification" J. Biol. Chem. 265:4718 (1990). Meyerhans A, Vartanian J-P, Wain-Hobson S. "DNA recombination during PCR" Nucleic Acids Res. 18:1687 (1990). Cheers!