MathSciNet bibliographic data MR1191613 (94a:03058) 03C55 (03E05 03E35 03E55 90D44) Mekler, Alan; Shelah, Saharon; Väänänen, Jouko The Ehrenfeucht-Fraïssé-game of length $\omega\sb 1$$\omega\sb 1$. Trans. Amer. Math. Soc. 339 (1993), no. 2, 567–580. Article

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