Marsha M. Cohen, Peter G. Duncan, William D. B. Pope, Diane Biehl, W. Arnold Tweed, Leonard MacWilliam, Richard N. Merchant,
The Canadian four-centre study of anaesthetic outcomes: II. Can outcomes be used to assess the quality of anaesthesia care? Canadian Journal of Anaesthesia-journal Canadien D Anesthesie. ,vol. 39, pp. 430- 439 ,(1992) ,
10.1007/BF03008706