Tanida M, Niijima A, Shen J, Nakamura T and Nagai K: Olfactory stimulation with scent of essential oil of grapefruit affects autonomic neurotransmission and blood pressure. Brain Res 1058,44-55 (2005)
Goel N and Lao RP: Sleep changes vary by odor perception in young adults. Biol Psychol 71, 341-349 (2006)
Aloisi AM, Ceccarelli I, Masi F and Scaramuzzino A: Effects of the essential oil from citrus lemon in male and female rats exposed to a persistent painful stimulation. Behav Brain Res 136, 127-135 (2002)