FIVE PAPERS BY CONNY PALM.

"Tele," English Edition No 1, 1957, Information from The Royal Board of Swedish Telecommunications, edited by E Malmgren, contains five papers by Conny Palm prefaced by a short article, "Research on Telephone Traffic Carried by Full Availability Groups." The first paper, "Some Propositions Regarding Flat and Steep Distribution Functions," characterizes two classes of distribution functions arising in telephone traffic congestion. In the second paper, "Some Observations on the Erlang Formulae for Busy Signal Systems," an attempt is made at a brief systematic investigation of the form and properties of the most important traffic functions, in addition to some numerical calculations and tabulation procedures. The third paper is called, "Contributions to the Theory on Delay Systems" Unlike a busy-signal system in which a call that finds all channels occupied makes a new try at calling later, a delay system permits a call to wait to obtain service. The fourth paper is called "Waiting Times with Random Served Queue." The fifth paper is entitled "Duration of Congestion States in Delay Systems" To avoid long delays it is desirable first to study the distribution function for the duration of the congestion states.