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sci-hub.se 参考文章(2)
Richard Courant, David Hilbert, Methoden der mathematischen Physik ,(1924)
Vibrations of Two-Dimensional Disordered Lattices Proceedings of The Royal Society A: Mathematical, Physical and Engineering Sciences. ,vol. 283, pp. 64- 82 ,(1965) , 10.1098/RSPA.1965.0007