S. Heidari- Keshel, M. Entezari, M. Rezaei-Tavirani, M. Ebrahimi, and M. Rezaei-Tavirani, “Functionalization of MWNT-COOH by one-step reaction with (3-oxoindolin-2-ylidene) urea and in vitro antitumor study on gastric cancer”, Gastroenterol Hepatol Bed Bench, vol. 6, no. Supplement 1, pp. Gastroenterol Hepatol Bed Bench 2013;6(Suppl.1):S39–S44, Oct. 2013.