Amplitude and Phase of Wave Packets in a Linear Potential
Georgi Gary Rozenman, Matthias Zimmermann, Maxim A. Efremov, Wolfgang P. Schleich, Lev Shemer, and Ady Arie
Phys. Rev. Lett. 122, 124302
Non-spreading wave packets
M. V. Berry and N Balazs
American Journal of Physics 47, 264 (1979) , with a 1980 comment
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