CSŰRÖS, Z., Gy. DEÁK, and P. SALLAY. 1972. “INVESTIGATION OF THE PREPARATION OF 2,4,6-TRIARYL-PYRYLIUM FLUOROBORATES FROM AROMATIC ALDEHYDES AND ARYL METHYL KETONES. I. THIN LAYER CHROMATOGRAPHY TESTING OF THE REACTION”. Periodica Polytechnica Chemical Engineering 16 (1):3-6.