Fejes Tóth, L. (1953). Lagerungen in der Ebene, auf der Kugel und im Raum. Die Grundlehren der Mathematischen Wissenschaften in Einzeldarstellungen mit besonderer Berücksichtigung der Anwendungsgebiete, Band LXV. Berlin, New York: Springer-Verlag. MR0057566.
Hsiang, Wu-Yi (1993). “On the sphere packing problem and the proof of Kepler's conjecture”. International Journal of Mathematics4 (5): 739–831. doi:10.1142/S0129167X93000364. ISSN0129-167X. MR1245351.
Hsiang, Wu-Yi (2001). Least action principle of crystal formation of dense packing type and Kepler's conjecture. Nankai Tracts in Mathematics. 3. River Edge, NJ: World Scientific Publishing Co. Inc.. ISBN978-981-02-4670-9. MR1962807.
Hsiang, Wu-Yi (1993). “On the sphere packing problem and the proof of Kepler's conjecture”. International Journal of Mathematics4 (5): 739–831. doi:10.1142/S0129167X93000364. ISSN0129-167X. MR1245351.
Hsiang, Wu-Yi (1993). “On the sphere packing problem and the proof of Kepler's conjecture”. International Journal of Mathematics4 (5): 739–831. doi:10.1142/S0129167X93000364. ISSN0129-167X. MR1245351.