The authors of the original paper were shown Dr. Lenhardt's letter [as will be our usual practice on such occasions, ed.] and the following is their reply:

✍ Scribed by E. Stennert; F.J. Schulte

• Book ID: 113362121
• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 140 KB
• Volume: 2
• Category: Article
• ISSN: 0378-3782
• DOI: 10.1016/0378-3782(78)90056-7