1. Appleby, M., Fuchs, C.A., Stacey, B.C., Zhu, H.: Introducing the Qplex: a novel arena for quantum theory. Eur. Phys. J. D 71(7), 197 (2017)
2. Bacciagaluppi, G.: A critic looks at QBism. In: New Directions in the Philosophy of Science, pp. 403–416. Springer, Cham (2014)
3. Bengtsson, I.: SICs: some explanations. Found. Phys. (2020). https://doi.org/10.1007/s10701-020-00341-9
4. Boge, F.J.: Quantum Mechanics Between Ontology and Epistemology. Springer, Berlin (2018)
5. Bohr, N.: Discussions with Einstein on epistemological problems in atomic physics. In: Schilpp, P.A. (ed.) Albert Einstein: Philosopher-Scientist, Library of Living Philosophers, Evanston (1949, reprinted, Harper and Row, 1959)