Jentschura, Ulrich David Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
Jentschura, U. D., Nándori, I., & Zinn-Justin, J. (2006). Effective action and phase structure of multi-layer sine-Gordon type models. Annals of Physics, 321(11), 2647-2659. doi:10.1016/j.aop.2006.01.005.