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    <subfield code="a">Dirac, P. A. M.</subfield>
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    <subfield code="a">His The principles of quantum mechanics ... 1930.</subfield>
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    <subfield code="a">Quantum, space, and time--the quest continues, 1984:</subfield>
    <subfield code="b">CIP t.p. (Paul Dirac)</subfield>
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    <subfield code="a">Orbis Scientiae (1983 : Miami, Fla.). High-energy physics, c1985:</subfield>
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    <subfield code="a">Polʹ Dirak i fizika XX veka, 1990.</subfield>
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    <subfield code="a">WWW Encyclopaedia Britannica, Aug. 4, 2005</subfield>
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