Pregnolatto, W., Sabino, M. and Chahin, C. 1971. Separation and identification of Betaine and Choline in mixture by paper chromatography. Instituto Adolfo Lutz Journal - RIAL. 31, 1-2 (Dec. 1971), 109–111. DOI:https://doi.org/10.53393/rial.1971.31.37013.