He organized biblical manuscripts into a classification system (Die griechischen Handschriften des Neuen Testaments, 1908) which is the system in use throughout the scholarly world today.
Ia mengorganisir naskah-naskah Alkitab ke dalam suatu sistem klasifikasi (Die griechischen Handschriften des Neuen Testaments, 1908) yang dipakai di kalangan ilmuwan dunia sampai sekarang.