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2. Foreman, M., Magidor, M. and Shelah, S., Martin's maximum, saturated ideals and non-regular ultrafilters, Annals of Maths. 127, pp. 1-47.
3. On the determinacy of games on ordinals;Harrington;Annals of Math. Logic,1972
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5. Harrington, L. and Sami, R., Equivalence relations, projective and beyond, in: Logic Colloquim ‘78’ (North-Holland) pp. 247-264.