Harper, D.B. Studies on plant growth-regulating substances : the plant growth- regulating activity of substituted phenols / D.B. Harper and R.L. Wa in. - Ashford, Kent : Wye College, University of London, 1969. - 395-407 p. : ill. ; 26 cm. - Reprint ; no. 444 . Includes bibliographical references: p. 406-407. Subjects--Topical Terms: Plant regulators.--------