Unsupervised data mining on spatial-temporal passenger mobility and survey data during Covid-19. - Philippe Büdinger; Tor-Morten Grønli (IEEE BigData, 2021)

Survey of Automated Fare Collection Solutions in Public Transportation. - Malte Bieler; Anders Skretting; Philippe Büdinger; Tor-Morten Grønli (IEEE Trans. Intell. Transp. Syst., 2022)