1. Erfahrungen über die Kulenkampffsche Anästhesie des Plexus brachialis, unter besonderen Berücksichtigung der Neben- und Nacherscheinungen;Härtel;Arch Klin Chir,1913
2. Brachial plexus anaesthesia. Its indications, technique and dangers;Kulenkampff;Ann Surg,1928
3. Ipsilateral hemidiaphragm paresis associated with interscalene brachial plexus anesthesia;Urmey;Anesthesiology,1989
4. Reductions in pulmonary function resulting from interscalene brachial plexus block;Urmey;Reg Anesth,1990
5. Paresis of the phrenic nerve during brachial plexus analgesia and its importance;Dhuner;Acta Chir Scand,1955