6.5 Numerical methods for differential equations A Rich Differential Equation for Computer Demonstrations, Bernard W. Banks, 21:1, 1990, 45-50, 6.4, 9.6 Newton's Principia and Inverse-Square Orbits, N. Nauenberg, 25:3, 1994, 212-221, 0.5, 2.2, 6.4 Computers, Lies, and the Fishing Season, Robert L. Borrelli and Courtney S. Coleman, 25:5, 1994, 401-412, 6.2, 6.4 FFF. Lively Cities, Jacques Laforgue, 33:4, 2002, 311-312, F, 9.10 Using a Gradient Vector to Find Multiple Periodic Oscillations in Suspension Bridge Models, L. D. Humphreys and P. J. McKenna, 36:1, 2005, 16-26, 6.4