MathSciNet bibliographic data MR398812 02F35 (02F30 02F27) Friedman, Harvey Recursiveness in $P\sp{1}\sb{1}$$P\sp{1}\sb{1}$ paths through ${\cal O}$${\cal O}$. Proc. Amer. Math. Soc. 54 (1976), 311–315. Article

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