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Knebusch, Manfred and Delfs, Hans (1982) Semialgebraic topology over a real closed field. In: Dubois, D.W. and Recio, T., (eds.) Ordered fields and real algebraic geometry. Proceedings of the special session on ordered fields and real algebraic geometry, 87th annual meeting of the AMS. Contemporary Mathematics, 8. American Mathematical Society, pp. 61-78. ISBN 0821850075; 978-0821850077.