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Journal Article SAMPLING WITH CONTROL VARIABLES Get access E. C. FIELLER, E. C. FIELLER Search for other works by this author on: Oxford Academic Google Scholar H. O. HARTLEY H. O. HARTLEY Search for other works by this author on: Oxford Academic Google Scholar Biometrika, Volume 41, Issue 3-4, 3 December 1954, Pages 494–501, https://doi.org/10.1093/biomet/41.3-4.494 Published: 03 December 1954
Fieller et al. (Fri,) studied this question.