J. Planar Chromatogr. 6, 296-299 (1993). Integration of four computer-assisted methods (the monofactor optimization system (MOS); the multicomponent solvent optimization system (MSOS); the difactor optimization system (DOS); and the stepwise gradient optimization (SGOS)) for optimizing HPTLC separation in order to produce the optimization system of TLC (OS T), resulting in a method development strategy which obtains simple solutions for simple separation problems and reserves the more complex solutions for difficult separations.

Proc. 9th Internat. Symp. Instr. Chromatogr., Interlaken, April 9.-11., 337-339 (1997). Prediction of retention data using multiple development and circular techniques from a single development.

J. Planar Chromatogr. b, 178-182 (2001). Evaluation of molecular interactions in liquid adsorption chromatography with mixed mobile phases. Two equations based on different retention mechanism models were verified experimentally. TLC on silica gel; development in horizontal chambers with cyclohexane - carbon tetrachloride, cyclohexane - ethylene chloride, n-heptane - ethylene chloride, and n-heptane - acetone.

2: Comparison of some parameters in OPLC and TLC. J. Planar Chromatogr. 6, 256-258 (1993). Investigation of the linearity of the calibration graph, the limits of detection and quantification and the precision of the data of an OPLC purity test during the development of chromatograms at different flow rates. The best results (lowest LOD and LOQ as well as the best precision) were obtained by OPLC when eluting with the optimum linear velocity. Quantification by densitometry at 237 nm.

Proc. Intern. Symp. on Planar Separations, Planar Chromatography 2001, pp. 91-101. HPTLC of sodium glutamate on silica gel. Quantitative TLC is considered as a typical separation technique where evaluation of uncertainty can be done with seriously planned validation. The contributions of sources calculated according to guidelines are so small that their effects on the final results are negligible.

J. Planar Chromatogr. 25, 269-276 (2012). Important steps to reduce the systematical errors in planar chromatography were described. Different aspects such as selecting the center of the plate, repairing the unwanted start chromatography by using a solvent, avoiding mobile phase interaction that may influence hRf values, improving signal integration by multi integration at mini stepwise positioning, applying statistical methods for outlier removal and data correlation of signal over substance mass were defined as important parameters to improve repeatability standard deviation.

Chromatographia 17, 640-642, (1983). A new method, aiming to eliminate systematic errors, connected with the visualization of the chromatographic spots on the investigated sorbents. TLC on cellulose with decalin-ethyl acetate 8:2. Detection by spraying with a solution of bromocresol green.

Part 1: Mixtures of solvents. J. High Resol.Chromatogr. 7, 104-106 (1984). TLC of red sudan G, indophenol blue, 4-dimethylaminobenzene on silica with chloroform - ethanol - benzene - hexane.