@ARTICLE{Gres38:Einflu,
AUTHOR="H. Gressel",
TITLE="Einflu?der hohen Belastungen von Teilnehmerleitungen in
Fernsprechanlagen",
JOURNAL="Zeitschrift für Fernmeldetechnik",
VOLUME=19,
NUMBER=3,
YEAR=1938,
LANGUAGE="German",
KEYWORDS="Loss system",
}

@ARTICLE{Palm38:Erlang,
AUTHOR="C. Palm",
TITLE="Analysis of the {Erlang} Traffic Formulæ for Busy-Signal
Arrangements",
JOURNAL=ericssont,
ADDRESS="Sweden",
VOLUME=4,
PAGES="39-58",
YEAR=1938,
KEYWORDS="Erlang B formula",
}

@TECHREPORT{Palm38:Några,
AUTHOR="C. Palm",
TITLE="Några undersökningar över trafikförhållandena vid stel koppling",
INSTITUTION="Telestyrelsen, Sua 717. Ikke publiceret",
ADDRESS="Sweden",
PAGES=12,
NOTE="Avskrift av manuskript",
YEAR=1938,
LANGUAGE="Swedish",
KEYWORDS="Traffic engineering",
}

@ARTICLE{Norw3804:Characteristic,
AUTHOR="A. C. Norwine and O. J. Murphy",
TITLE="Characteristic time intervals in telephone conversations",
JOURNAL=bstj,
VOLUME=17,
NUMBER=4,
PAGES="281--291",
MONTH=apr,
YEAR=1938,
KEYWORDS="silence detection; talkspurt; voice source model",
ABSTRACT="Two-way conversation is arbitrarily defined in terms of vocal
intervals and the pauses between them. These quantities, as determined
by the presence or absence of speech energy, have been measured from
continuous oscillograms of calls on a New York -- Chicago telephone
circuit used for Bell System business, and the results of statistical
analyses of these data are presented.",
ANNOTE="labels as talkspurt talking without talker change, i.e., with
pauses",
}