| http://www.w3.org/ns/prov#value | - Whitehead published a book in 1939<ref> J.B. Whitehead, ''Electricity and Magnetism - An Introduction to the Mathematical Theory'', McGraw-Hill, New York 1939.</ref> in which he tried to put more emphasis on the Maxwellian background because already before the war there was a tendency to neglect the finer aspects of electromagnetism in electrical engineering.
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