Different transformations for solving non-convex trim-loss problems by MINLP. - Iiro Harjunkoski; Tapio Westerlund; Ray Pörn; Hans Skrifvars (Eur. J. Oper. Res., 1998)

Global solution of optimization problems with signomial parts. - Ray Pörn; Kaj-Mikael Björk; Tapio Westerlund (Discret. Optim., 2008)

MINLP: Trim-loss Problem. - Iiro Harjunkoski; Ray Pörn; Tapio Westerlund (Encyclopedia of Optimization, 2009)

A Case Study on Programming in Finnish General Upper Secondary Education. - Markus Norrby; Niklas Palmberg; Ray Pörn (Koli Calling, 2022)

Pupil-Robot Interaction in a Math Card Game: An Iterative Process of Studying the Use of Social Robotics in Primary School Math Education. - Mattias Wingren; Mats Braskén; Ray Pörn; Sören Andersson (RiE, 2022)