M. Bar and M. Neta, Humans prefer curved visual objects, Psychological Science, vol.17, issue.8, pp.645-648, 2006.

W. S. Cleveland and R. Mcgill, Graphical perception: Theory, experimentation, and application to the development of graphical methods, Journal of the American Statistical Association, vol.79, issue.387, pp.531-554, 1984.

W. C. Eells, The relative merits of circles and bars for representing component parts, Journal of the American Statistical Association, vol.21, issue.154, pp.119-132, 1926.

S. Fenton, Pie charts are bad. Personal journal on the web, pp.2019-2020, 2009.

S. Few, Save the pies for dessert, Visual Business Intelligence Newsletter, pp.2019-2020, 2007.

B. Gabrielle, Why Tufte is flat-out wrong about pie charts. Web log post. Speaking PowerPoint -The new language of business, 2013.

J. Heer and M. Bostock, Crowdsourcing graphical perception: using Mechanical Turk to assess visualization design, Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, pp.203-212, 2010.

R. Kosara, In defense of pie charts, 2011.

R. Kosara and D. Skau, Judgment error in pie chart variations, Eurographics Conference on Visualization, 2016.

M. Lima, Why humans love pie charts -an historical and evolutionary perspective. Noteworthy -The Journal Blog, 2018.

C. Nussbaumer, Death to pie charts. Web log post. Storytelling with Data, pp.2019-2020, 2011.

E. M. Peck, B. F. Yuksel, A. Ottley, R. J. Jacob, C. et al., Using fNIRS brain sensing to evaluate information visualization interfaces, Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, CHI '13, pp.473-482, 2013.

. R-core-team, R: A Language and Environment for Statistical Computing. R Foundation for Statistical Computing, 2019.

H. Siirtola, The cost of pie charts, 23rd International Conference on Information Visualisation (IV19), 2019.

D. Simkin and R. Hastie, An information-processing analysis of graph perception, Journal of the American Statistical Association, vol.82, issue.398, pp.454-465, 1987.

D. Skau and R. Kosara, Arcs, angles, or areas: individual data encodings in pie and donut charts, Computer Graphics Forum, vol.35, pp.121-130, 2016.

I. Spence and S. Lewandowsky, Displaying proportions and percentages, Applied Cognitive Psychology, vol.5, pp.61-77, 1991.

E. R. Tufte and R. Von-huhn, Further studies in the graphic use of circles and bars: A discussion of the Eell's experiment, Journal of the American Statistical Association, vol.22, issue.157, pp.31-39, 1927.

H. Wickham, ggplot2: Elegant Graphics for Data Analysis (Use R!), 2010.

H. Wickham, tidyverse: Easily Install and Load 'Tidyverse' Packages, 2017.

H. Wickham and G. Grolemund, R for Data Science: Import, Tidy, Transform, Visualize, and Model Data, 2016.