I'm a little suspicious of the dates- which are so near the end of Heise's life as to suggest he composed all 3 of his cello sonatas (this is #1, the cello sonata "#1" on the page so labeled is actually #3 it seems, and he died two years after the composition of #1 in 1870) in a very brief time. It's possible, of course. Eric 18:53, 19 July 2010 (UTC)
