M. Cerulli, A. Chioccariello, и E. Lemut. 5th CERME conference - congress of European Society for Research in Mathematics Education, Larnaca, Cyprus, (2007)
D. Dominici, P. Gill, и T. Limpanuparb. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Science, 468 (2145):
2667-2681(сентября 2012)
M. Yuan, и T. Cai. (2012)cite arxiv:1211.2607Comment: Published in at http://dx.doi.org/10.1214/09-AOS772 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org).