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References:
[1] DOLD A.: Lectures on Algebraic Topology. Springer-Verlag 1972. MR 0415602 | Zbl 0234.55001
[2] HEJNÝ M.: Models of the Klein Bottle. Acta Fac. Rerum. nat. Univ. Com. Math. (to appear). MR 0568335 | Zbl 0443.57006
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