Liu, Z.; Bateman, A.; Sohail, S.; Zinner, B.; Roland Sr., D. Statistical Sensitivity Required to Detect Any Potential Difference of Bioavailability Between DL-Methionine and DL-Methionine Hydroxy Analogue in Layers. Int. J. Poult. Sci. 2004, 3 (11), 697–703. https://doi.org/10.3923/ijps.2004.697.703.