12th international congress of head and neck radiology. 17th congress of the European Society of Neuroradiology. 1st Congress of the World Federation of Interventional and Therapeutic Neuroradiology
12th international congress of head and neck radiology. 17th congress of the European Society of Neuroradiology. 1st Congress of the World Federation of Interventional and Therapeutic Neuroradiology : October 6-13, 1991, Zürich, Switzerland