Sewell, W. E. Generalized derivatives and approximation. (English) Zbl 0012.06201 Proc. Natl. Acad. Sci. USA 21, 255-258 (1935). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 2 Documents Keywords:Analysis × Cite Format Result Cite Review PDF Full Text: DOI Link