Halperin, Max; Hartley, H. O.; Hoel, P. G. (1965), «Recommended Standards for Statistical Symbols and Notation. COPSS Committee on Symbols and Notation», The American Statistician, 19 (3): 12–14, JSTOR2681417, doi:10.2307/2681417
jstor.org
Halperin, Max; Hartley, H. O.; Hoel, P. G. (1965), «Recommended Standards for Statistical Symbols and Notation. COPSS Committee on Symbols and Notation», The American Statistician, 19 (3): 12–14, JSTOR2681417, doi:10.2307/2681417