He was co-author of an edition on
Philo of Alexandria, "Philonis Alexandrini opera quae supersunt" (6 volumes, 1896-1915).[1] With
Otto Kern, he published "Beiträge zur Geschichte der griechischen Philosophie und Religion" (1895).[2]
Die hellenistisch-römische Kultur in ihren Beziehungen zu Judentum und Christentum, 1907 – Greco-Roman culture in its relations with
Judaism and
Christianity.
Die urchristlichen Literaturformen, 1912 –
Early Christian literature forms.
Die griechische Prosa und die römisch-christliche Literatur, 1912 – Greek prose and Roman-Christian literature.
Philonis Alexandrini opera quae supersunt, 6 volumes, (with
Leopold Cohn), 1896-1915.