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Ribár Béla; Kapor Agneš; Kálmán Alajos; Argay Gyula; Fülöp Ferenc; Bernáth Gábor: X-ray study of the hetero ring flexibility in 5,6-tri, 5,6-tetra- and 5,6-penta-methylene-2,3,5,6-tetrahydro-1,3-oxazin-4-ones : the structures of 2-spiropentamethylene-cis-5,6-tetramethylene-2,3,5,6-tetrahydro-l,3-oxazin-4-one (I), 2-spiropentamethylene-cis-5,6-pentamethylene-2,3,5,6-tetrahydro-l,3-oxazin-4-one (c-II) and 2-spiropentamethylene-trans-5,6-pentamethylene-2,3,5,6-tetrahydro-1,3-oxazin-4-one (t-II). In: Kolligátum. pp. 125-139. (1989)