Najafzadeh; Ithnin; Karimi.
"An Analytical Model for Sparse and Dense Vehicular Ad hoc Networks".
"Advances in Computer Science and Information Technology":
First International Conference on Computer Science and Information Technology, CCSIT 2011.
p. 211.
US 5761431, Gross, Kevin Paul; Anderson, Charles William & Lieb, Derek Wearin, "Order persistent timer for controlling events at multiple processing stations", published 1998-06-02, assigned to Peak Audio Inc.