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The author's specialization in Heidelberg was supported by “Zajednica za nauku SR Bosne i Hercegovine”.
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Cigić, V. A theorem on finite projective planes of odd order and an application to planes of order 15. Arch. Math 41, 280–288 (1983). https://doi.org/10.1007/BF01194841
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DOI: https://doi.org/10.1007/BF01194841