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R. G. Larson and M. E. Sweedler, “An Associative Orthogonal Bilinear form for Hopf Algebras,” American Journal of Mathematics, Vol. 91, No. 1, 1969, pp. 75-94. doi:10.2307/2373270

has been cited by the following article:

• TITLE: The Integrals of Entwining Structure

  AUTHORS: Yuzhuo Yuan, Lihong Dong, Zhengming Jiao

  KEYWORDS: Entwining Structure; Integral; Forgetful Functor; Natural Transformation

  JOURNAL NAME: Advances in Pure Mathematics, Vol.3 No.4, July 1, 2013

  ABSTRACT: In this paper the integrals of entwining structure (A,C,ψ) are discussed, where A is a k-algebra, C a k-coalgebra and a k-linear map. We prove that there exists a normalized integral γ:C→Hom(C,A) of (A,C,ψ) if and only if any representation of (A,C,ψ) is injective in a functorial way as a corepresentation of C. We give the dual results as well.