His first publication appeared in 1927 on Einstein 's general covariance postulate, and his next, in the same year, was his doctoral dissertation Die Randwert-und Eigenwertprobleme aus der Theorie der elastischen Platten on the theory of elastic plates.
Kanyang unang publikasyon ay lumitaw sa 1,927 sa Einstein 's pangkalahatang covariance panuntunan, at kanyang tabi, sa parehong taon, ay kanyang doktor disertasyon Randwert Die-und Eigenwertprobleme aus der Theorie der elastischen Platten sa teorya ng mga sunud-sunuran plates.