Mixed states in one spatial dimension: decompositions and correspondence with nonnegative matrices.
Gemma De las Cuevas and Tim Netzer. J. Math. Phys. 61, 041901 (2020). arXiv:1907.03664
Gemma De las Cuevas and Tim Netzer. J. Math. Phys. 61, 041901 (2020). arXiv:1907.03664