%0 Journal Article %A Gil, MarĂ­a Angeles %T Comparing the suitability of two factors for stratification in estimating diversity %J Kybernetika %D 1991 %P 495-505 %V 27 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/KYB_1991__27_6_a1/ %G en %F KYB_1991__27_6_a1