Reference
L. Fejes Tóth, On the permeability of a circle-layer,Studia Sci. Math. Hungar. 1 (1966), 5–10.MR 34 # 6640
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Hajnal, A., Tóth, L.F. Research problems. Period Math Hung 9, 173–174 (1978). https://doi.org/10.1007/BF02018932
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DOI: https://doi.org/10.1007/BF02018932