1. Abbot, E. (1984). Flatland (Reprint of the 1884 edition). New York: Signet Classic Books.
2. Annells, M. (2006). Triangulation of qualitative approaches: hermeneutical phenomenology and grounded theory. Journal of Advanced Nursing, 56(1), 55–61.
3. Barnes, M. (2000). Magical moments in mathematics: Insights into the process of coming to know. For the Learning of Mathematics, 20(1), 33–43.
4. Barnett, L. B., & Corazza, L. (1993). Identification of mathematical talent and programmatic efforts to facilitate development of talent. European Journal for High Ability, 4, 48–61.
5. Benbow, C. P., Lubinski, D., & Sushy, B. (1996). The impact of SMPY’s educational programs from the perspective of the participant. In C. P. Benbow & D. Lubinski (Eds.), Intellectual talent (pp. 266–300). Baltimore: Johns Hopkins University Press.