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)

费利克斯·克莱因

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]

T细胞

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

泽尔尼克多项式

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

模λ函數

其與克萊因j函數（英语：Klein J-invariant）的關係為： j ( τ ) = 256 ( 1 − λ ( 1 − λ ) ) 3 ( λ ( 1 − λ ) ) 2 = 256 ( 1 − λ + λ 2 ) 3 λ 2 ( 1 − λ ) 2 . {\displaystyle j(\tau

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