Behaviour of tubular contour of hypar-formed hanging roofsKulbach, ValdekTubular Structures : The Third International Symposium1990 / p. 437-442 : ill Sound radiation by a submerged axially reinforced shellKlauson, Aleksander; Metsaveer, JaanEuropean Conference on Underwater Acoustics1992 / p. 381-384: ill