Romberg, Andreas : Doppelquartette, SteR 125
| Carl Friedrich Peters an Louis Spohr in Kassel | Leipzig, Freitag 11. April 1823 | 1823041150 |
| Eduard Grund an Louis Spohr in Kassel | Hamburg, Mittwoch 5. April 1826 | 1826040539 |
| Carl Friedrich Peters an Louis Spohr in Kassel | Leipzig, Freitag 11. April 1823 | 1823041150 |
| Eduard Grund an Louis Spohr in Kassel | Hamburg, Mittwoch 5. April 1826 | 1826040539 |