Monograph by Eugen Sänger

I could swear there passed through my hands once a monograph by
Eugen Sänger about photon rockets and antimatter propulsion,
interstellar flight.
It was auf Deutsch , and I don't think there ever was an English translation.
I don't think it was a collection of his papers from Astronautica Acta.
Can't seem to find a bibliography of his work.
Anybody know the title?