Chen, Xuejiao; Li, Yuanfei Continuous dependence on the boundary parameter of the harmonic equation in unbounded region. (Chinese. English summary) Zbl 1488.35049 J. Henan Univ., Nat. Sci. 51, No. 3, 373-378 (2021). MSC: 35B30 35B35 35J15 PDF BibTeX XML Cite \textit{X. Chen} and \textit{Y. Li}, J. Henan Univ., Nat. Sci. 51, No. 3, 373--378 (2021; Zbl 1488.35049) Full Text: DOI
Zhang, Sibao; Jiang, Lianxia Discussion on the positive integer solution of equation \(k\varphi (m) = S(m^t)\). (Chinese. English summary) Zbl 1488.11012 J. Henan Univ., Nat. Sci. 51, No. 3, 367-372 (2021). MSC: 11A25 11D41 PDF BibTeX XML Cite \textit{S. Zhang} and \textit{L. Jiang}, J. Henan Univ., Nat. Sci. 51, No. 3, 367--372 (2021; Zbl 1488.11012) Full Text: DOI