There is apparently a Times obituary, but that is behind a paywall. However, I found an obituary on the Edinburgh University site at Scots Law News:
Perhaps, however, Tony’s greatest contribution to comparative law, at least so far as the Anglophone world is concerned, is his translation of Zweigert and Kötz’s Einführung in die Rechtsvergleichung (Introduction to Comparative Law), which has had a remarkable impact from the time of its first appearance in 1977. Zweigert and Kötz themselves paid Tony this handsome compliment: “Indeed, one American professor of law who is fluent as a native in both German and English went so far as to say that the translation was better than the original, rare though that is, and acceptable, he was kind enough to add, though the original in this case was.”
There's a bibliography on that site too. Zweigert and Kötz in either language is a great read.