@article{articlecacf7d25,
title   = {On the definition of the time evolution operator for time-independent Hamiltonians in non-relativistic quantum mechanics},
author = {Amaku, Marcos and Coutinho, Francisco A. B. and Toyama, F, Masafumi},
year = {2017},
doi = {10.1119/1.4985723},
journal   = {American Journal of Physics}
}