@book {Ryba_1993,
	title = {The open door: Pan-European academic co-operation. Denis Kallen, Guy Neave},
	year = {1991},
	month = {nov},
	publisher = {Unesco European Centre for Higher Education, CEPES},
	organization = {Unesco European Centre for Higher Education, CEPES},
	address = {Bucharest},
	doi = {10.1086/447217},
	url = {https://doi.org/10.1086\%2F447217}
}
