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@incollection{Chang_1991,  doi = {10.1142/9789814503464_0094},  url = {http://dx.doi.org/10.1142/9789814503464_0094},  year = {1991},  month = {mar},  publisher = {World Scientific Pub Co Pte Lt},  pages = {724--726},  author = {L. L Chang and L. Esaki and R. Tsu},  title = {{Resonant tunneling in semiconductor double barriers}},  booktitle = {Semiconductor Devices: Pioneering Papers},  }  @article{Chang_1974,