Fisher, B. A note on the solution in series of ordinary differential equations. (English) Zbl 0262.34004 Delta 3, No. 3, 16-22 (1973). MSC: 34A25 PDFBibTeX XML
Fisher, B. A note on the integration of total differential equations. (English) Zbl 0268.34002 Delta 2, No. 3, 31-33 (1971). MSC: 34A05 PDFBibTeX XML