Klein's j-invariant

Ketov, S. V. Nonlinear Sigma model （页面存档备份，存于互联网档案馆） on Scholarpedia. U. Kulshreshtha, D.S. Kulshreshtha and H.J.W. Mueller-Kirsten, ``Gauge invariant O(N)

Wright. Indra's Pearls: The Vision of Felix Klein [因陀罗的珍珠：费利克斯·克莱因的眼界]. 剑桥大学出版社. 2002年5月 [2005-10-17]. （原始内容存档于2020-11-21） （英语）.  Klein's Web Pages [克莱因相关在线资源]

Bianchini E, De Biasi S, Simone AM, Ferraro D, Sola P, Cossarizza A, Pinti M. Invariant natural killer T cells and mucosal-associated invariant T cells in multiple

U.U; Khansari, Mohammad; Jafari-Khouzani, Kourosh. Rotation and noise invariant near-infrared face recognition by means of Zernike moments and spectral

doi:10.1016/j.jnt.2014.07.010. （原始内容存档于2018-06-29） （英语）.  Duda, Jarek. Optimal encoding on discrete lattice with translational invariant constrains using