Copy and paste this citation
Jon P. Ruddick,
Andrew K. Evans,
David J. Nutt,
Stafford L. Lightman,
Graham A.W. Rook
and Christopher A. Lowry
(2006).
Tryptophan metabolism in the central nervous system: medical implications. Expert Reviews in Molecular Medicine,
8
,
pp 1-27
doi:10.1017/S1462399406000068