On the class of extremal extensions of a nonnegative operator

By Y. Arlinskii̇̆, S. Hassi, Z. Sebestyén, H. D. de Snoo. 2001

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A description of all self-adjoint extensions of the Laplacian and Kreĭn-type resolvent formulas on non-smooth domains (2009, unknown): “109], [8], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [31], [46, Part III], [50, Sect.”
On Kreĭn's extension theory of nonnegative operators (2004, background): “e.g. [ 8, Theorem 4.4 ] and the references therein).”
A general factorization approach to the extension theory of nonnegative operators and relations (2007, background): “This extends the treatment for densely defined nonnegative operators in [4].”