Bertel Thorvaldsen and Joseph Anton Koch both studied .
Bertel Thorvaldsen and Joseph Anton Koch both worked with him in Rome , and copied many of his works ; Koch made etchings of several , which were published in Rome in 1799 .
Bertel Thorvaldsen and Joseph Anton Koch both studied and worked with him in Rome , and copied many of his works ; Koch made etchings of several , which were published in Rome in 1799 .