edited by Matti Krusius and Matti Vuorio ; editorial secretary, Mona Grönstrand ; : North-Holland, : American Elsevier. -- North-Holland. -- (Proceedings of the 14th International Conference on Low Temperature Physics, Otaniemi, Finland, August 14-20, 1975 / edited by Matti Krusius and Matti Vuorio ; editorial secretary, Mona Grönstrand ; v. 4).