@article{hatfield_bilbro_1999, title={Simulation of room temperature thermionic emission from AlxGa1- xN negative electron affinity cathodes}, volume={17}, number={2}, journal={Journal of Vacuum Science & Technology. B, Microelectronics and Nanometer Structures}, author={Hatfield, C. W. and Bilbro, G. L.}, year={1999}, pages={552–556} }
 @article{hatfield_bilbro_1999, title={Simulation of thermionic emission from aluminum gallium nitride cathodes at elevated temperatures}, volume={17}, number={5}, journal={Journal of Vacuum Science & Technology. B, Microelectronics and Nanometer Structures}, author={Hatfield, C. W. and Bilbro, G. L.}, year={1999}, pages={1987–1992} }