Cenkl, Bohumil Affine connections with zero torsion. (English) Zbl 0276.57010 Partial diff. Equ., Berkeley 1971, Proc. Sympos. Pure Math. 23, 375-377 (1973). MSC: 57R30 53B05 PDF BibTeX XML OpenURL
Jacobowitz, Howard Deformations leaving a hypersurface fixed. (English) Zbl 0263.53003 Partial diff. Equ., Berkeley 1971, Proc. Sympos. Pure Math. 23, 343-351 (1973). MSC: 53A05 PDF BibTeX XML OpenURL