https://en.wikipedia.org/wiki/Aloys_Schmitt
https://imslp.org/wiki/Category:Schmitt,_Aloys
https://imslp.org/wiki/List_of_works_by_Aloys_Schmitt
https://www.ub.uni-frankfurt.de/musik/schmitt.html
https://portal.dnb.de/opac.htm?method=simpleSearch&cqlMode=true&query=idn%3D116799293