共 10 条
[7]
OBSTETRIC ANALGESIA - A NEW MACHINE FOR THE SELF-ADMINISTRATION OF NITROUS OXIDE OXYGEN
[J].
PROCEEDINGS OF THE ROYAL SOCIETY OF MEDICINE-LONDON,
1949, 42 (09)
:745-746
[8]
SEWARD EH, 1957, INHALATION ANALGESIA, P53
[9]
TUNSTALL ME, 1961, LANCET, V2, P964