Pinel le Dret, Valentin MPI for Comparative and International Private Law, Max Planck Society;
https://www.academia.edu/31135559/Stolen_Works_of_Art_and_the_American_Art_Market_the_Legacies_of_Schiele_and_Klimt_Study_on_the_U_S_Law_on_Art_Restitution) (Any fulltext)
Pinel le Dret, V. (2016). Stolen Works of Art & the American Art Market, the Legacies of Schiele & Klimt. Master Thesis, Université Paris I - Panthéon-Sorbonne, Paris.