1. Gastric biopsy under direct vision: evaluation of a new instrument and the value of the dissecting microscope;Umeda;Gastroiniestinal Endoscopy,1970
2. Biopsy applications of a large channel endoscope;Vennes;Gastrointestinal Endoscopy,1975
3. Endoscopic, histologic and symptomatic evaluation of the postgastrectomy patient;Martin;Gastrointestinal Endoscopy,1976
4. Big particle biopsy;Ottenjann;Endoscopy,1973
5. Experimental bleeding ulcer in the dog: a negative study;Martin;Gastrointestinal Endoscopy,1976