@article{rezaiee-pajand_karkon_2012,  title={Two efficient hybrid-trefftz elements for plate bending analysis},  volume={9},  ISSN={1679-7825},  url={https://doi.org/10.1590/S1679-78252012000100003},  DOI={10.1590/S1679-78252012000100003},  number={1},  journal={Latin American Journal of Solids and Structures},  publisher={Individual owner},  author={Rezaiee-Pajand, Mohammad and Karkon, Mohammad},  year={2012},  pages={43–67} }