1. Controlled studies in clinical cancer research;Chalmers;New Engl. J. Med.,1972
2. Conduct of cooperative field and clinical trials;Greenberg;Amer. Statist.,1959
3. The organization of cooperative effort by multiple hospitals, exemplified by testing of therapeutic agents in rheumatoid arthritis;Herrera;Meth. Inform. Med.,1962
4. Planning and management aspects of cooperative trials;Kuzma;J. clin. Pharmacol.,1970
5. Maintaining interest among members of cooperative clinical study group;Greenberg;Cancer Chemother. Rep.,1970