A. Paris-Mandoki, C. Braun, and S. Hofferberth. Latin American School Of Physics Marcos Moshinsky (ELAF2017) : Quantum Correlations, 1950, page 020001. AIP, (2018)
P. Steinhorst, and A. Sändig. Inverse problems : an international journal on the theory and practice of inverse problems, inverse methods and computerized inversion of data, 28 (8):
085010, 1-24(2012)