MathSciNet bibliographic data MR394717 (52 #15516) 57E25 Kim, Paik Kee ${\rm PL}$${\rm PL}$ involutions on the nonorientable $2$$2$-sphere bundle over $S\sp{1}$$S\sp{1}$. Proc. Amer. Math. Soc. 55 (1976), no. 2, 449–452. Article

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