Li, Ziping; Tany, Taiming; Huang, Yongchang Canonical Ward identities for non-local transformation. (Chinese. English summary) Zbl 0937.70020 Acta Math. Sci. (Chin. Ed.) 19, No. 1, 23-29 (1999). MSC: 70S15 81T13 PDFBibTeX XMLCite \textit{Z. Li} et al., Acta Math. Sci. (Chin. Ed.) 19, No. 1, 23--29 (1999; Zbl 0937.70020)
Li, Ziping; Tang, Taiming A generalization of the PoincarĂ©-Cartan invariant and Dirac’s conjecture. (Chinese. English summary) Zbl 0895.70013 Acta Math. Sci. (Chin. Ed.) 17, No. 2, 192-199 (1997). MSC: 70H03 70G45 70H15 PDFBibTeX XMLCite \textit{Z. Li} and \textit{T. Tang}, Acta Math. Sci. (Chin. Ed.) 17, No. 2, 192--199 (1997; Zbl 0895.70013)