Citation: Afm. Ter Elst et Dw. Robinson, Second-order subelliptic operators on Lie groups III: Holder continuous coefficients, CALC VAR P, 8(4), 1999, pp. 327-363
Citation: Afm. Ter Elst et Dw. Robinson, Second-order subelliptic operators on lie groups I: Complex uniformly continuous principal coefficients, ACT APPL MA, 59(3), 1999, pp. 299-331