@article{bektas_2015,  title={LEAST SQUARES FITTING OF ELLIPSOID USING ORTHOGONAL DISTANCES},  volume={21},  ISSN={1982-2170},  url={https://doi.org/10.1590/S1982-21702015000200019},  DOI={10.1590/S1982-21702015000200019},  number={2},  journal={Boletim de Ciências Geodésicas},  publisher={Universidade Federal do Paraná},  author={BEKTAS, SEBAHATTIN},  year={2015},  month={Apr},  pages={329–339} }