Zorka Smedarchina, Willem Siebrand, Marek Z. Zgierski, “An instanton approach to intramolecular hydrogen exchange: Tunneling splittings in malonaldehyde and the hydrogenoxalate anion”, The Journal of Chemical Physics, 103, no. 13, 1995, 5326
Dimitri Antoniou, Steven D. Schwartz, “Activated chemistry in the presence of a strongly symmetrically coupled vibration”, The Journal of Chemical Physics, 108, no. 9, 1998, 3620