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    Reply.H. Messel - 1967 - Dialectica 21 (1‐4):142-143.
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    Remarque.H. Messel - 1967 - Dialectica 21 (1):256.
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    Relativity and Magnetism for High School Students.H. Messel - 1967 - Dialectica 21 (1‐4):292-310.