Tombline, G, D Bellizzi, and V Sgaramella. "Heterogeneity of primer extension products in asymmetric PCR is due both to cleavage by a structure-specific exo/endonuclease activity of DNA polymerases and to premature stops." Proceedings of the National Academy of Sciences 93.7 (1996): 2724-2728. Web. 25 Aug. 2019.