Geodesic
Effective estimates from below of the norms of ideals of an imaginary quadratic field
Sbornik. Mathematics, Tome 11 (1970) no. 1, pp. 47-58

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Let $K=Q(\sqrt{-\Delta})$ be an imaginary quadratic field with discriminant $-\Delta$, and with ideal class number $h(\Delta)$. It is proved that there exists an ideal class in which the norm of all the integral ideals is not less than $(\lg\Delta)^{-c}\sqrt\Delta$, where the constant $c=c(h)$ can be effectively computed for given $h$. Bibliography: 9 titles. 
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     author = {E. A. Anfert'eva and N. G. Chudakov},
     title = {Effective estimates from below of the norms of ideals of an imaginary quadratic field},
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     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1970_11_1_a2/}
}
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E. A. Anfert'eva; N. G. Chudakov. Effective estimates from below of the norms of ideals of an imaginary quadratic field. Sbornik. Mathematics, Tome 11 (1970) no. 1, pp. 47-58. http://geodesic.mathdoc.fr/item/SM_1970_11_1_a2/