@article{ghasemi_jafari_2017,  title={Morphological Characterization of Tungsten Trioxide Nanopowders Synthesized by Sol-Gel Modified Pechini's Method},  volume={20},  ISSN={1516-1439},  url={https://doi.org/10.1590/1980-5373-MR-2017-0467},  DOI={10.1590/1980-5373-MR-2017-0467},  number={6},  journal={Materials Research},  publisher={ABM, ABC, ABPol},  author={Ghasemi, Leila and Jafari, Hassan},  year={2017},  month={Nov},  pages={1713–1721} }