Diakses tanggal 24 Maret 2019. Heller, Eric J. (15 Oktober 1984). "Bound-State Eigenfunctions of Classically Chaotic Hamiltonian Systems: Scars of Periodic
bernama POP Camarota, Steven A., and Karen Jensenius (2008). "Homeward Bound: Recent Immigration Enforcement and the Decline in the Illegal Alien Population"
Globalization," Fides et Historia. 31:2, 1999 pp. 103–123. Chanda, Nayan (2007). Bound Together: How Traders, Preachers, Warriors and Adventurers Shaped Globalization
konsentris yang melewati titik-titik ujung sumbu utama elips, and the lower bound 4 a 2 + b 2 {\displaystyle 4{\sqrt {a^{2}+b^{2}}}} adalah keliling dari