@inproceedings{918d986090be4285b77cf4d246e20068,
title = "The importance of national options in IEA international comparative studies: Exploring the effects of language proficiencey upon secondary students' performance in TIMSS'99 mathematics in South Africa",
keywords = "METIS-219578",
author = "Howie, {Sarah J.} and Tjeerd Plomp",
year = "2004",
language = "English",
editor = "Constantinos Papanastasiou",
booktitle = "IRC 2004",
publisher = "University of Cyprus",
note = "Conference 2004 - TIMSS : Proceedings of the international research ; Conference date: 01-01-1900",
}