Asymptotic behavior of the approximation numbers of the Hardy-type operator from L p into L q (cases 1 < p ≤ q ≤ 2 , 2 ≤ p ≤ q < ∞ and 1 < p ≤ 2 ≤ q < ∞ ). Lang, J.; Mendez, O.; Nekvinda, A. — 2004 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]