Meziani, Abdelhamid. (2002). HYPOELLIPTICITY OF NONSINGULAR CLOSED 1-FORMS ON COMPACT MANIFOLDS
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COMMUNICATIONS IN PARTIAL DIFFERENTIAL EQUATIONS, 27(7-8), 1255-1269. 10.1081/pde-10486448
Meziani, Abdelhamid. (2002). HYPOELLIPTICITY OF NONSINGULAR CLOSED 1-FORMS ON COMPACT MANIFOLDS
. COMMUNICATIONS IN PARTIAL DIFFERENTIAL EQUATIONS, 27(7-8), 1255-1269. 10.1081/pde-10486448