References
E. Hellinger, «Die Orthogonalinvarianten Quadratischer Formen von unendlichvielen Variablen», Diss., Gottingen (1907).
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Appling, W.D.L. Concerning a certain nonlinear integral equation. Rend. Circ. Mat. Palermo 11, 126–128 (1962). https://doi.org/10.1007/BF02849430
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DOI: https://doi.org/10.1007/BF02849430