Convenient, efficient, and green method for synthesis of bis(indolyl)methanes with nano SIO2 under ultrasonic irradiation Keivan Ghodrati*, Saied Hosseine Hosseini, Rasol Mosaedi, Changiz Karami, Fariba Maleki, Azita Farrokhi, Zohreh Hamidi, 10.1186/2228-5326-3-13 XML Requires Subscription PDF Requires Subscription HTML downloads: 127 views: 38