"Surface rutting of thin pavements and gravel roads under standard and reduced tire inflation pressures," by Ahmed Shalaby and Alan Reggin, Canadian Journal of Civil Engineering, 29, 679-691, 2002.
"Under (Controlled) Pressure," by Carol Ludorf, Transportation Communications, Fleet Equipment, August 2002.
"Air as Needed," by David Cullen, Fleet Owner, September 2003.