Anil Yagcioglu AE, Kivircik Akdede BB, Turgut TI, Tümüklü M, Yazici MK, Alptekin K, Ertugrul A, Jayathilake K, Gögüs A, Tunca Z, Meltzer HY. A double-blind controlled study of adjunctive treatment with risperidone in schizophrenic patients partially responsive to clozapine: efficacy and safety. J Clin Psychiatry. 2005 Jan 1 ; 66(1):63-72. Pubmed Abstract