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References
- ↑ Kolmogorov, Andrey Nikolaevich; Fomin, Sergei Vasilyevich (1975) [1970]. Introductory real analysis . New York: Dover Publications. ISBN 978-0-486-61226-3..
- ↑ Gelfand, Israel Moisevich; Fomin, Sergei Vasilyevich (2000) [1963]. Calculus of variations. Mineola, New York: Dover Publications. ISBN 978-0-486-41448-5..
