Shoe me the Way: A Shoe-Based Tactile Interface for Eyes-Free Urban Navigation. - Maximilian Schirmer; Johannes Hartmann; Sven Bertel; Florian Echtler (MobileHCI, 2015)

Exploring the Potential of Depictions with Sun Reflections. - Patrick Tobias Fischer; Eva Hornecker; Johann Gielen; Johannes Hartmann; Marco Schmandt; Anna Rack; Marie Bornemann; Felix Dondera (PerDis, 2015)

MMM Ball: Showcasing the Massive Mobile Multiuser Framework. - Tim Weißker; Andreas Berst; Johannes Hartmann; Florian Echtler (CHI Extended Abstracts, 2016)

The massive mobile multiuser framework: enabling ad-hoc realtime interaction on public displays with mobile devices. - Tim Weißker; Andreas Berst; Johannes Hartmann; Florian Echtler (PerDis, 2016)

BinarySwipes: Fast List Search on Small Touchscreens. - Johannes Hartmann; Maximilian Schirmer; Florian Echtler (MuC, 2019)

Finding optimal strategies in sequential games with the novel selection monad. - Johannes Hartmann (CoRR, 2021)

Algorithm Design with the Selection Monad. - Johannes Hartmann; Jeremy Gibbons (TFP, 2022)

Towards a More Efficient Selection Monad. - Johannes Hartmann; Tom Schrijvers; Jeremy Gibbons (TFP, 2024)