@article{medek_frydman_1999,  title={Multiple - quantum magic - angle spinning NMR: a new technique for probing quadrupolar nuclei in solids},  volume={10},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50531999000400003},  DOI={10.1590/S0103-50531999000400003},  number={4},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Medek, Ales and Frydman, Lucio},  year={1999},  month={Jul},  pages={263–277} }