Norman et al. 's comments on his paper were shown to Professor Barrows, who has replied as follows:

✍ Scribed by H. S. Barrows

• Book ID: 115079797
• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 132 KB
• Volume: 24
• Category: Article
• ISSN: 0308-0110
• DOI: 10.1111/j.1365-2923.1990.tb02458.x