Pham Ngoc Thao Intrinsic differential operators on manifolds and boundary-value problems elliptic in a subspace. (English) Zbl 0323.58018 Differ. Equations 10(1974), 1438-1448 (1976). MSC: 58J99 58J10 35F05 35F15 PDFBibTeX XMLCite \textit{Pham Ngoc Thao}, Differ. Equations 10, 1438--1448 (1976; Zbl 0323.58018)
Pham Ngoc Thao Boundary-value problems for intrinsic differential operators on manifolds. (English) Zbl 0255.35032 Differ. Equations 6(1970), 674-683 (1973). MSC: 58J99 47F05 PDFBibTeX XMLCite \textit{Pham Ngoc Thao}, Differ. Equations 6, 674--683 (1973; Zbl 0255.35032)
Pham Ngoc Thao Natural differential operators on compact manifolds. (English) Zbl 0246.58004 Differ. Equations 5 (1969), 160-170 (1972). MSC: 58J99 58A99 53Cxx PDFBibTeX XMLCite \textit{Pham Ngoc Thao}, Differ. Equations 5, 160--170 (1972; Zbl 0246.58004)
Pham Ngoc Thao Boundary value problems for natural differential operators on manifolds. (Russian) Zbl 0199.41602 Differ. Uravn. 6, 877-888 (1970). MSC: 58J99 47F05 PDFBibTeX XMLCite \textit{Pham Ngoc Thao}, Differ. Uravn. 6, 877--888 (1970; Zbl 0199.41602)
Pham Ngoc Thao Natural differential operators on compact manifolds. (Russian) Zbl 0169.24401 Differ. Uravn. 5, 186-198 (1969). Reviewer: H. Guggenheimer MSC: 58A99 58J99 53Cxx PDFBibTeX XMLCite \textit{Pham Ngoc Thao}, Differ. Uravn. 5, 186--198 (1968; Zbl 0169.24401)