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3. Anderson, I.M., 2004a. The Variational Complex. Dept. of Mathematics, Utah State University, Logan, Utah, 318 pages. Manuscript available at http://www.math.usu.edu/~fg_mp/Publications/VB/vb.pdf.
4. Anderson, I.M., 2004b. The Vessiot package; the software with documentation is available at http://www.math.usu.edu/~fg_mp/Pages/SymbolicsPage/VessiotDownloads.html.
5. Anderson, I.M., Cheb-Terrab, E., 2009. DifferentialGeometry package, Maple Online Help, www.maplesoft.com/support/help/Maple/view.aspx?path=DifferentialGeometry.