Lasota, A.; Opial, Z. Fixed-point theorems for multi-valued mappings and optimal control problems. (English) Zbl 0165.43304 Bull. Acad. Pol. Sci., Sér. Sci. Math. Astron. Phys. 16, 645-649 (1968). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 5 Documents Keywords:ordinary differential equations PDFBibTeX XMLCite \textit{A. Lasota} and \textit{Z. Opial}, Bull. Acad. Pol. Sci., Sér. Sci. Math. Astron. Phys. 16, 645--649 (1968; Zbl 0165.43304)