In 1908 Kelsen won a research scholarship which allowed him to attend the University of Heidelberg for three consecutive semesters, where he studied with the distinguished jurist Georg Jellinek before returning to Vienna.
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While still in Austria, Kelsen entered the debate on the versions of Public Law prevailing in his time by engaging the predominating opinions of Jellinek and Gerber in his 1911 Habilitation dissertation (see description above).
Jellinek thinks (l.c.) that there were several haggadic midrashim to Canticles, each of which interpreted the book differently, one referring it to the exodus from Egypt, another to the revelations on Mt. Sinai, and a third to the Tabernacle or the Temple in Jerusalem; and that all these midrashim were then combined into one work, which, with various additions, forms the present Shir ha-Shirim Rabbah.
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Some scholars (I.H. Weiss, Dor iii. 263-264; and Adolf Jellinek, in a letter to Theodor, reprinted in Monatsschrift, 1879, pp. 237 et seq.), moreover, have assumed a direct connection between such ancient discourses and the present Canticles Rabbah, regarding this midrash as an old collection of these discourses, increased by various later additions.
Version A was likewise known to Judah Hadassi, the Karaite, in the 13th century (see Jellinek, B. H. iii., xvii. 5).
When Jellinek received his first Simplex on 1 March 1902 at Nice, he rushed to incorporate it into his Mercedes race team, competing in the Nice-La Turbie hillclimbing race.
Early in the seventeenth century Menahem Lonzano issued his small but useful supplement, Ma'arik, concerned particularly with foreign words (in Shete Yadot, Venice, 1618; newly edited by Jellinek, Leipzig, 1853).