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 PDFBibTeX XML
Zachmanoglou, E. C. Propagation of zeroes of solutions of P.D.E.’s along leaves of foliations. (English) Zbl 0261.35004 Partial diff. Equ., Berkeley 1971, Proc. Sympos. Pure Math. 23, 369-374 (1973). MSC: 35A05 57R30 PDFBibTeX XML