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In search of compound perforations
Canadian revenue newsletter
no. 199, 1991, p. [3-4]; no. 200, 1991, p. . see also "Compound perfs do exist" by E.S.J. van Dam in no. 200, 1991, p. . See also "The last word on O197" by Edward Zaluski in no. 203, 1992, p. [3-4]; no. 204, 1992, p. 4.
Morin, Cimon. Canadian philately: bibliography and index. Volumes 1-3. 1979-1998. Reference 6070