Ray, D. B.; Singer, I. M. Analytic torsion. (English) Zbl 0273.58014 Partial diff. Equ., Berkeley 1971, Proc. Sympos. Pure Math. 23, 167-181 (1973). MSC: 58J10 35P20 PDF BibTeX XML OpenURL
Goldschmidt, Hubert On the Spencer cohomology of a Lie equation. (English) Zbl 0264.58010 Partial diff. Equ., Berkeley 1971, Proc. Sympos. Pure Math. 23, 379-385 (1973). MSC: 58H05 58J99 35N10 22E65 PDF BibTeX XML OpenURL
Kohn, J. J. Pseudo-differential operators and hypoellipticity. (English) Zbl 0262.35007 Partial diff. Equ., Berkeley 1971, Proc. Sympos. Pure Math. 23, 61-69 (1973). MSC: 35H10 35S05 58J40 PDF BibTeX XML OpenURL