PD Partial differential operators of elliptic type by Shimakura, Norio, American Mathematical Society fromTranslations of mathematical monographs 0 Type: Book
HM Hypoellipticité maximale pour des opérateurs polynomes de champs de vecteurs by Helffer, Bernard, Nourrigat, Jean fromProgress in mathematics 0 Type: Book
HC Heisenberg calculus and spectral theory of hypoelliptic operators on Heisenberg manifolds by Ponge, Raphaël fromMemoirs of the American Mathematical Society 0 Type: Book
