E. Sand

Differences in age of walking in five European longitudinal samples.

G. Klackenberg, C. Hindley, A. M. Filliozat, 1966, Human biology.

SOME DIFFERENCES IN INFANT FEEDING AND ELIMINATION TRAINING IN FIVE EUROPEAN LONGITUDINAL SAMPLES

G. Klackenberg, A. M. Filliozat, D. Nicolet‐Meister, 1965 .

Body length,body weight and head circumference in Belgian boys and girls aged 1-36 months: sex difference and effect of socioeconomic status

R. Hauspie, C. Susanne, E. Sand, 1992 .