@article{bettega_lopes_lima_ferreira_2006,  title={Electron collisons with cyclobutane},  volume={36},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332006000400018},  DOI={10.1590/S0103-97332006000400018},  number={2b},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Bettega, M. H. F. and Lopes, A. R. and Lima, M. A. P. and Ferreira, L. G.},  year={2006},  month={Jun},  pages={570–575} }