Sharp estimates for operatorbar partial _M on aq-concave CR manifoldon aq-concave CR manifold

We construct integral operatorsR _r andH _r on the spaces of differential forms of the type (o, r) withr <q on a regularq-concave CR manifoldM such that $$f(z) = bar partial _M R_r (f)(z) + R_{r + 1} (bar partial _M f)(z) + H_r (f)(z),$$ for a differential formf ∈ L _(0,r) ^s (M) and forz ∈ M′ ?M, whereH _r is compact andR _r admits sharp estimates.