@inproceedings{PPDP-2014-Karczmarczuk,
	author        = "Jerzy Karczmarczuk",
	booktitle     = "{Proceedings of the 16th International Symposium on Principles and Practice of Declarative Programming}",
	doi           = "10.1145/2643135.2643162",
	isbn          = "978-1-4503-2947-7",
	pages         = "105--110",
	publisher     = "{ACM}",
	title         = "{On the Declarative Structure of Quantum Concepts: States and Observables}",
	year          = 2014,
}