@article{silva_silva junior_ramos_2005,  title={Hydrogen bonds between pyrazine and HX linear acids (X = F, NC, CN and CCH): a theoretical study},  volume={16},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532005000500025},  DOI={10.1590/S0103-50532005000500025},  number={4},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Silva, João Bosco P. da and Silva Junior, Mário R. and Ramos, Mozart N.},  year={2005},  month={Jul},  pages={844–850} }