1. Armstrong A. and J. Meissner. 2010. Railway Revenue Management: Overview and Models . Tech. Rep. Department of Management Science Lancaster University Management School.
2. Hummel R. S. Banga and T. P. Hettmansperger. 2005. Better Confidence Intervals for the Variance in a Random Sample . Tech. Rep. Department of Statistics The Pennsylvania State University.
3. Engineering the Neural Automatic Passenger Counter
4. Statistics in Medicine
5. Köhler S. S. Bobinger R. Branick B. Cerfontaine S. Krogull A. Luther M. Ritschel et al. 2018. Recommendations for the Application of APCSs Within Public Transport and Regional Rail Transport . V. 2.1. VDV-Recommendations 457. Köln: Verband Deutscher Verkehrsunternehmen (VDV). https://www.beka-verlag.de/ebook-vdv-schrift-457-automatic-passenger-counting-systems-v2-1.html.