Friedrich Wille
Galerkins Loesungsnaeherungen bei monotonen Abbildungen
Mathematische Zeitschrift 127 (1972) 10-16
is written entirely in rhymed verse ("Knittelverse"), and I still
remember its beginning
So mancher hat schon nachgedacht,
wie man's mit Ritz-Galerkin macht ...
It is fun to read, and it is serious mathematics. It's also a piece
of poetry, provided you consider Wilhelm Busch an author of such.
W.F.