1. Principal Curves of Time-Intensity data (Leiden Psychological Reports PRM 02-91);Buuren,1991
2. Analyzing time-intensity responses in sensory evaluation;Buuren;Food Technology,1992
3. Matching TI-curves;Dijksterhuis,1992
4. Principal Component Analysis of Time-Intensity bitterness curves;Dijksterhuis;Journal of Sensory Studies,1993