[4] He also produced over 30 endoscopic films and more than 20,000 colored slides to teach and inform interested colleagues about his technique.His first atlas, "More Details on Pelviscopy and Hysteroscopy" was published in 1976, a slide atlas on pelviscopy, hysteroscopy, and fetoscopy in 1979, and his books on gynecological endoscopic surgery in German, English, and many other languages in 1984, 1987, and 2002.