| Abstract
| - In the approximations for a product, and the subsequent calculations, a factor of ½ was omitted. The approximations should be on Πλi≏λ¯t-1(1-12Sλλ/λ¯2) p. 251, Πλi≏λ¯t-1(1-12Sλλ/λ¯2) on p. 266, and Π′ξi≏a^-(t-1)(1+12w/a^2)Π′ξi≏a^-(t-1)(1+12w/a^2)on p. 267. Corrected values for D in Table 8, p. 268 are available from the author. The approximations are now even better in the situations of interest. The value for A when π = 1 for process (c3) in Table 10, p. 273 is 0·839. On p. 267 the two occurrences of ‘ν¯’ should be removed. The year for the Schuster et al. paper is 1978. On p. 276 the Hedayat & Federer reference should read ‘nonexistence’ and not ‘existence’.
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