Keitel, Christoph H. Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
http://www.sciencedirect.com/science/article/pii/037596019290220G (Publisher version)
Wódkiewicz, K., & Keitel, C. H. (1992). On the information entropy of squeezed states and the entropic uncertainty relation. Physics Letters. A, 167(2), 151-160. doi:10.1016/0375-9601(92)90220-G.