@article{melo_pimentel_lopes_calazans_2007,  title={Application of fractional factorial design to levan production by Zymomonas mobilis},  volume={38},  ISSN={1517-8382},  url={https://doi.org/10.1590/S1517-83822007000100010},  DOI={10.1590/S1517-83822007000100010},  number={1},  journal={Brazilian Journal of Microbiology},  publisher={Sociedade Brasileira de Microbiologia},  author={Melo, I.R. and Pimentel, M.F. and Lopes, C.E. and Calazans, G.M.T.},  year={2007},  month={Jan},  pages={45–51} }