@ARTICLE{Elli28:Artificial,
AUTHOR="E. A. Elliman and R. W. Fraser",
TITLE="An artificial traffic machine for automatic telephone studies",
JOURNAL=ec,
YEAR=1928,
KEYWORDS="Traffic machine",
}

@BOOK{Cajo28:History,
AUTHOR="F. Cajori",
TITLE="A History of Mathematical Notations, Volume {I:} Notations in
Elementary Mathematics",
PUBLISHER="The Open Court Publishing Company",
YEAR=1928,
KEYWORDS="Mathematics; history",
}

@ARTICLE{Nyqu28:Certain,
AUTHOR="H. Nyquist",
TITLE="Certain topics in telegraph transmission theory",
JOURNAL="Transactions A.I.E.E.",
ADDRESS="New York",
PAGES="617-644",
MONTH=feb,
YEAR=1928,
KEYWORDS="Transmission theory; reference",
ABSTRACT="The reference paper.",
}