Sweden returns ancient coins to Greece

Athens News Agency is reporting that Sweden has returned 48 ancient coins, excavated in 1922, to Greece.

http://www.ana.gr/anaweb/user/showplain?maindoc=4107003&maindocimg=4106201&service=100

This is not a case of looted coins and Greek demands for repatriation. The coins were just taken out for conservation, and the conservation took a long time. "The Greek ambassador noted that Sweden had never disputed the ownership of the coins, protecting and preserving them in two university laboratories in Lunb and Uppsala."

"During the '70s they were the focus of an archaeological study carried out by Sweden's Royal Numismatic Museum that was published in 1980."

Can anyone tell me what the study was?