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The second author wishes to thank the Canadian National Research Council for the opportunity to visit the University of Toronto during the session 1971–72, and also the United Kingdom Science Research Council for travel assistance.
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Atkinson, F.V., Evans, W.D. On solutions of a differential equation which are not of integrable square. Math Z 127, 323–332 (1972). https://doi.org/10.1007/BF01111391
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DOI: https://doi.org/10.1007/BF01111391