Alpay D., Colombo F., Sabadini I., “Preface”: Alpay, D Colombo, F Sabadini, I, Quaternionic de Branges Spaces and Characteristic Operator Function, Springerbriefs in Mathematics, Springer International Publishing Ag, 2020, V+
Alpay D., Colombo F., Lewkowicz I., Sabadini I., “Realizations of Slice Hyperholomorphic Generalized Contractive and Positive Functions”, Milan J. Math., 83:1 (2015), 91–144
Alpay D., Behrndt J., “Generalized $Q$-functions and Dirichlet-to-Neumann maps for elliptic differential operators”, J. Funct. Anal., 257:6 (2009), 1666–1694
Derkach V., “Abstract Interpolation Problem in Nevanlinna Classes”, Modern Analysis and Applications: Mark Krein Centenary Conference. Vol. 1: Operator Theory and Related Topics, Operator Theory Advances and Applications, 190, 2009, 197–236
Vladimir Derkach, Modern Analysis and Applications, 2009, 197
Melik-Adamyan P., “Krein–Saakyan and Trace Formulas for a Pair of Canonical Differential Operators”, Complex Analysis and Operator Theory, 1:3 (2007), 423–438