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1 Huili Liu, Yanhua Yu, Seoung DalJung, Invariants of non-developableruled surfaces in Euclidean 3-space,Beitraege zur Algebra undGeometrie, 55(2014), 189-199.
2 Yanhua Yu, Huili Liu, Seoung DalJung, Structure and characterizationof ruled surfaces in Euclidean3-space, Applied Mathematics andComputation, Volume 233, 1 May2014, Pages 252-259.
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