Engel, FriedrichFriedrichEngel2022-07-042013-12-112022-07-041938http://nbn-resolving.de/urn:nbn:de:hebis:26-opus-104888https://jlupub.ub.uni-giessen.de/handle/jlupub/2618http://dx.doi.org/10.22029/jlupub-2315deIn Copyrightddc:439