اهلين وسهلين
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Atanassov K. T., Remarks on φ, σ and ohter functions, C.R. Acad. Bulgare Sci., 41, 1988, стр. 41-44
Mitrinovic D.S., Popadic M.S., Inequalities in the number theory, Nis, 1978, стр. 44
Atanassov K. T., Remarks on φ, σ and ohter functions, C.R. Acad. Bulgare Sci., 41, 1988, стр. 41-44
Sandor J., Remarks on two papers by K.T. Atanasov, Bull. Number Theory Rel. Topics, 12, 1988, стр. 56-59Mitrinovic D.S., Popadic M.S., Inequalities in the number theory, Nis, 1978, стр. 44
S . Ramanujan, "The Lost Notebook and other unpublished papers",
Narosa Publishing House, New Delhi (1987), p . 280-308 .
G . Robin, Grandes valeurs de la fonction somme des diviseurs et
hypothese de Riemann, J . Math . pures et appl ., 63 (1984),
p . 187-213
Narosa Publishing House, New Delhi (1987), p . 280-308 .
G . Robin, Grandes valeurs de la fonction somme des diviseurs et
hypothese de Riemann, J . Math . pures et appl ., 63 (1984),
p . 187-213