ELL C. [red.] 547,435 Lasers in gastroenterology : international experiences and trends/ ed. by J.F. Riemann and C. Ell ; forew. by A.G. Hofstetter ; with contributions by S. Bonvoisin [et al.]. - Stuttgart ; New York : Georg Thieme Verl., [1989]. - XI, [1], 164 s. : il., wykr. ; 25 cm ISBN 3-13-720501-8 ISBN 0-86577-292-4