Plasma tryptophan and tyrosine ratios to competing amino acids in relation to antidepressant response to citalopram and maprotiline - Møller, S. E.; Beurs, P.; Timmerman, L.; Tan, B. K.; Leijnse-Ybema, H. J.; Cohen Stuart, M. H.; Høpfner Petersen, H. E. (Springer, 1986)
http://dx.doi.org/10.1007/BF00310520
Keywords: WW-YZ