ArticleSystems of Frequency CurvesF. N. DavidUniversity College , London , England·W. P. Elderton·N. L. Johnson·1970·enABIABI:AkademIndex/openalex/2026.other.723811CiteAbstractNo abstract available.IdentifiersDOI10.2307/1267366Citations and referencesCited by 20 referencesMetrics — AkademScholar