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APPENDIX (11) On this subject see Morris, Michael S.. Thorne, Kip S., and Yurtsever, Ulvi: "Wormholes, Time Machines and the Weak Energy Condition" in Physical Review Letters vol. 61, no. 13, 26 Sept. 1988. On multidimensional models see "The Self-Reproducing Universe" by Mallove, Eugene F., Sky and Telescope, Sept. 1988 p. 255. (12) The arguments for a multidimensional approach to the natural history of the UFO phenomenon have been developed by the author in the book Dimensions (Chicago: Contemporary Books, 1988; New York: Ballantine, 1989). 257