Huidige controversen en nieuwe ontwikkelingen in de anesthesiologie / [door H. van Aken ... et al.]New developments in drugs used in anaestesia : proceedings of a satellite symposium at the 8th European Congress of Anaesthesiology, Warsaw, Poland, 12 September 1990 / ed.: Carl Hug, Hugo van AkenRecent advances in epidural analgesia in obstetrics / ed. H. Van Aken, A. Van Assche