Costa Pereira, N. (August–September 1985). «A Short Proof of Chebyshev's Theorem». American Mathematical Monthly. 92 (7): 494–495. doi:10.2307/2322510. JSTOR2322510.
Costa Pereira, N. (August–September 1985). «A Short Proof of Chebyshev's Theorem». American Mathematical Monthly. 92 (7): 494–495. doi:10.2307/2322510. JSTOR2322510.