Walter H. Muller, Peter Lorber, Barron Haley, Volatile Growth Inhibitors Produced by Salvia leucophylla: Effect on Seedling Growth and Respiration, Bulletin of the Torrey Botanical Club, Vol. 95, No. 5 (Sep. - Oct., 1968), pp. 415-422
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Müller et al. (1968) studied this question.