6.P. GEOMETRICAL VANISHING
Gardner. MM&M. 1956. Chap. 7 & 8: Geometrical Vanishing -- Parts I & II, pp. 114 155. Best extensive discussion of the subject and its history.
Gardner. SA (Jan 1963) c= Magic Numbers, chap. 3. Discusses application to making an extra bill and Magic Numbers adds citations to several examples of people trying it and going to jail.
Gardner. Advertising premiums to beguile the mind: classics by Sam Loyd, master puzzle poser. SA (Nov 1971) = Wheels, Chap. 12. Discusses several forms.
S&B, p. 144, shows several versions.
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