@book{692,
	author = {Clayton, Albert E.},
	title = {The Performance and Design of Direct Current Machines; A Textbook for Students at Universities and Technical Schools, Covering the Syllabuses of the B. Sc. (Eng.), the I.E.E.},
	publisher = {Sir Isaac Pitman & Sons},
	year = {1949},
	address = {London},
	edition = {2nd ed.}
}