5.2.10 Improper integrals Calculus by Mistake, Louise S. Grinstein, 5:4, 1974, 49-53, C, 5.1.2, 5.1.4, 5.2.2, 5.2.3, 5.2.5, 5.4.2, 5.6.1, 5.7.2 Circumference of a CircleÑThe Hard Way, David P. Kraines and Vivian Y. Kraines and David A. Smith, 21:2, 1990, 142-144, C, 5.2.2 FFF #62. An Improper Integral, Ed Barbeau, 24:4, 1993, 343, F Numerical Methods for Improper Integrals, Gerald Flynn, 26:4, 1995, 284-291, 9.6 FFF #101. The Disappearing Factor, James C. Kirby, 27:2, 1996, 117, F, 5.2.3 FFF #117. Blowing up the Integrand, Ronald J. Fischer, 28:3, 1997, 199, F Two Historical Applications of Calculus, Alexander J. Hahn, 29:2, 1998, 93-103, 5.1.4 GabrielÕs Wedding Cake, Julian F. Fleron, 30:1, 1999, 35-38, 5.4.2 FFF #261. A new ÒproofÓ of an old result, William Grounds, 38:1, 2007, 44, F An Improper Application of GreenÕs Theorem, Robert L. Robertson, 38:2, 2007, 142-145, C, 5.7.3