6.6 Other topics in differential equations An Alternative Approach to the Vibrating String Problem, James Chew, 12:2, 1981, 147-149, C Computer Graphics for the Vibrating String, Howard Lewis Penn, 17:1, 1986, 79-89 A New Look at the Airy Equation with Fences and Funnels, John H. Hubbard, Jean Marie McDill, Anne Noonburg, and Beverly H. West, 25:5, 1994, 419-431, 6.2 Distinguised Oscillations of a Forced Harmonic Oscillator, T. G. Proctor, 26:2, 1995, 111-117, 6.2 Zeroing In on the Delta Function, Joan R. Hundhausen, 29:1, 1998, 27-32 How to Pump a Swing, Stephen Wirkus and Richard Rand and Andy Ruina, 29:4, 1998, 266-275, 9.9