Art. 84 CISG
(1) If the seller is bound to refund the price, he must also pay interest on it, from the date on which the price was paid.
(2) The buyer must account to the seller for all benefits which he has derived from the goods or part of them:
The Secretariat Commentary on Art. 69 of the 1978 New York Draft, predecessor to Art. 84 CISG, gives insight into the drafters' unterstanding on the eve of the 1980 Vienna Diplomatic Conference.
CISG-AC Opinion regarding Art. 84 CISG
Overview of case law on Art. 84 CISG: UNCITRAL Digest
The UNCITRAL Digest on the CISG can be used as a starting point to discover the relevant case law on this article.