Effects of tryptophan loading on human cognition, mood, and sleep
Neuroscience & Biobehavioral Reviews (2010) - Comments
pubmed: 19715722  doi: 10.1016/j.neubiorev.2009.08.005  issn: 1873-7528  issn: 0149-7634 

B.Y. Silber, J.A.J. Schmitt