Thomas Brihaye Christian Michaux Cédric Rivière Cell decomposition and dimension function in the theory of closed ordered differential fields. 111-128 2009 159 Ann. Pure Appl. Logic 1-2 http://dx.doi.org/10.1016/j.apal.2008.09.029 db/journals/apal/apal159.html#BrihayeMR09