@article{ghorbani-vaghei_veisi_2010,  title={Poly(N,N'-dichloro-N-ethyl-benzene-1, 3-disulfonamide) and N,N,N',N'-tetrachlorobenzene-1,3-disulfonamide as novel catalytic reagents for synthesis of bis-indolyl, tris-indolyl, di(bis-indolyl), tri(bis-indolyl) and tetra(bis-indolyl)methanes under solid-state, solvent and water conditions},  volume={21},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532010000200002},  DOI={10.1590/S0103-50532010000200002},  number={2},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Ghorbani-Vaghei, Ramin and Veisi, Hojat},  year={2010},  pages={193–201} }