Two-qubit trace-norm geometric discord: the complete solution. - Piotr Lugiewicz; Andrzej M. Frydryszak; Lech Jakóbczyk (Quantum Inf. Process., 2019)

On Extremal Positive Maps of Three-Dimensional Matrix Algebra. - Piotr Lugiewicz; Robert Olkiewicz (Open Syst. Inf. Dyn., 2021)

On a New Family of Extremal Positive Maps of Three-Dimensional Matrix Algebra. - Piotr Lugiewicz; Robert Olkiewicz (Open Syst. Inf. Dyn., 2021)