Landscape vs portrait mode: which is faster to use on your smart phone?

Karsten Seipp, Kate Devlin. Landscape vs portrait mode: which is faster to use on your smart phone?. In Michael Rohs, Albrecht Schmidt, Daniel Ashbrook, Enrico Rukzio, editors, 15th International Conference on Human-Computer Interaction with Mobile Devices and Services, MobileHCI '13, Munich, Germany, August 27 - 30, 2013. pages 534-539, ACM, 2013. [doi]

@inproceedings{SeippD13,
  title = {Landscape vs portrait mode: which is faster to use on your smart phone?},
  author = {Karsten Seipp and Kate Devlin},
  year = {2013},
  doi = {10.1145/2493190.2494422},
  url = {http://doi.acm.org/10.1145/2493190.2494422},
  researchr = {https://researchr.org/publication/SeippD13},
  cites = {0},
  citedby = {0},
  pages = {534-539},
  booktitle = {15th International Conference on Human-Computer Interaction with Mobile Devices and Services, MobileHCI '13, Munich, Germany, August 27 - 30, 2013},
  editor = {Michael Rohs and Albrecht Schmidt and Daniel Ashbrook and Enrico Rukzio},
  publisher = {ACM},
  isbn = {978-1-4503-2273-7},
}