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M. Nair (February 1982). “On Chebyshev-Type Inequalities for Primes”. American Mathematical Monthly89 (2): 126–129. doi:10.2307/2320934. JSTOR2320934.
N. Costa Pereira (August–September 1985). “A Short Proof of Chebyshev's Theorem”. American Mathematical Monthly92 (7): 494–495. doi:10.2307/2322510. JSTOR2322510.
M. Nair (February 1982). “On Chebyshev-Type Inequalities for Primes”. American Mathematical Monthly89 (2): 126–129. doi:10.2307/2320934. JSTOR2320934.