Search for: [Subject and Keywords = Matematyka \-\- \-\- \-\- \-\- czasopisma. \[KABA\]] OR [Subject and Keywords = Matematyka \-\- zastosowania naukowe \-\- \-\- \-\- czasopisma. \[KABA\]] OR [Subject and Keywords = Matematyka \-\- \-\- \-\- \-\- czasopisma. \[KABA\]] OR [Subject and Keywords = Matematyka \-\- zastosowania naukowe \-\- \-\- \-\- czasopisma. \[KABA\]] OR [Title = On the analysis of a set of characteristics] OR [Title = On the analysis of a set of characteristics] OR [Creator = Perkal, Julian \(1913–1965\)] OR [Creator = Perkal, Julian \(1913–1965\)]