@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}, author = {D. Kallen and G. Neave} }