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Masujima, Michio. (2005).
Applied Mathematical Methods in Theoretical Physics (MASUJIMA:INTEGR.EQUATIONS O-BK) || Hilbert-Schmidt Theory of Symmetric Kernel. , (), 109–147.
doi:10.1002/3527605843.ch5
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research
