Who said “International Law is the vanishing point of jurisprudence'?

Holland, in his book 'Jurisprudence,' described international law as the 'vanishing point of jurisprudence,' meaning that international law exists at the boundary where municipal (domestic) law ends and lacks the coercive enforcement mechanism that characterizes true law. This view contrasts with Austin's command theory, Kelsen's Pure Theory, and Bentham's utilitarian approach to law.