@book
{TN_libero_mab2,
author = {
Webb, P. J.
},
title = {
The effect of an advisory speed signal on motorway traffic speeds
},
publisher = {Transport and Road Research Laboratory},
year = {1980},
booktitle = {TRRL supplementary report ; 615},
address = {
Crowthorne, Berkshire
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}