1. 📘 2022

Classification of Classical Friedrichs Differential Operators: One-Dimensional Scalar Case

Journal: Commun. Pure Appl. Anal., 10, 3499–3527

Proving the von Neumann type decomposition for abstract Friedrichs operators, classifying admissible boundary conditions for one dimensional scalar Friedrichs operators.

2. 📘 2025

Friedrichs Systems on an Interval

Journal: Ann. Funct. Anal. 16, 54 (2025).

Proving technical result related to smoothness of totalprojections of Lipschitz continuous matrix, rank theorem for one dimensional vectorial Friedrichs operators.

3. 📘 2025

The von Neumann Extension Theory for Abstract Friedrichs Operators

Journal: Z. Anal. Anwend., 44 (1/2), pp. 193–218

A comprehensive analysis of von Neumann’s extension theory for abstract Friedrichs operators, including a new characterisation of abstract Friedrichs operators.

4. 📘 2025
m-Accretive Extensions of Friedrichs Operators
K. Burazin, M. Erceg, and S. K. Soni

A preprint discussing new developments in the m-accretive extension theory of Friedrichs operators, and other boundary conditions.

5.📘 2024

Classification of Boundary Conditions for Friedrichs Systems

Ph.D. Dissertation, University of Zagreb

This dissertation provides a rigorous classification scheme for boundary conditions for Friedrichs systems.