LEVAI, G., RŮŽIČKA, F., ZNOJIL, M. Three Solvable Matrix Models of a Quantum Catastrophe. International Journal of Theoretical Physics. 2014, 53(9), 2875-2890. ISSN 0020-7748. E-ISSN 1572-9575. Available: https://doi.org/10.1007/s10773-014-2085-x