@article{article1c89d849,
title   = {Two definitions of the eletric polarizability of a bound system in relativistic quantum theory},
author = {Coutinho, Francisco Antônio Bezerra and Nogami, Y. and Tomio, Lauro},
year = {1999},
doi = {10.1119/1.19362},
journal   = {American Journal of Physics}
}