@incollection{CostelloFoster2021, author = {Cathryn Costello and Michelle Foster}, title = {Non-refoulement as custom and jus cogens? Putting the prohibition to the test}, booktitle = {Netherlands Yearbook of International Law}, volume = {46}, url = {https://link.springer.com/chapter/10.1007/978-94-6265-114-2_10}, year = {2021}, }