Article Jia, Xiaoyong; Li, Yuewu (2009)
The Calculus of Variations from Euler to Lagrange: As a Result of Formalized Improvement. Ziran Kexueshi Yanjiu (Studies in the History of Natural Sciences) (p. 312). (/isis/citation/CBB000933767/) unapi

Article Yuan, Min; Jia, Xiaoyong (2008)
A Historical Survey: Why Did Lagrange Redefine the Complete Integral of a First-Order Partial Differential Equation. Ziran Kexueshi Yanjiu (Studies in the History of Natural Sciences) (p. 485). (/isis/citation/CBB000933545/) unapi

Article Jia, Xiao-yong; Wang, Peng-yun (2007)
The Algorithm for Syzygy in the Seleucid Period of Ancient Babylon. Journal of Dialectics of Nature (pp. 91-95). (/isis/citation/CBB000760567/) unapi