On Wikipedia https://en.wikipedia.org/wiki/Petersen_Quartet
Alternative Spellings Peterson Quartett, Peterson String Quartet
Creation 1979
City Berlin, Germany
Country Germany
Links Allmusic
Discogs

The Petersen Quartet is a string quartet founded in 1979 by students at the Hanns Eisler Music Conservatory in Berlin, including founding first violinist, Ulrike Petersen, who has recently rejoined the quartet to alternate in the first chair with Conrad Muck. They have been guided by, amongst others, Sandor Vegh, Thomas Brandis and the Amadeus Quartet. wikipedia