ヘンリー・ヘルソン
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Helson, Henry (1958). “Conjugate series and a theorem of Paley”. Pacific J. Math. 8 (3): 437–446. doi:10.2140/pjm.1958.8.437. MR0098952.
with David Lowdenslager: “Prediction theory and Fourier series of several complex variables”. Acta Math. 99: 165–202. (1958). doi:10.1007/bf02392425. MR97688.
Helson, Henry (1959). “Conjugate series in several variables”. Pacific J. Math.