Leslie D McFadden, Eric V McDonald, Stephen G Wells, Kirk Anderson, Jay Quade, Steven L Forman,
The vesicular layer and carbonate collars of desert soils and pavements: formation, age and relation to climate change Geomorphology. ,vol. 24, pp. 101- 145 ,(1998) ,
10.1016/S0169-555X(97)00095-0