@article{khattri_2007,  title={Grid generation and adaptation by functionals},  volume={26},  ISSN={1807-0302},  url={https://www.scielo.br/j/cam/a/KQfnf3bLSnzRcdyJCmCkTzL/},  number={2},  journal={Computational & Applied Mathematics},  publisher={Sociedade Brasileira de Matemática Aplicada e Computacional},  author={Khattri, Sanjay Kumar},  year={2007},  pages={235–249} }