Smash products, group actions and group graded rings. Soren Jondrup; Anders Jensen — 1991 Mathematica Scandinavica
An Algorithm for Lifting Points in a Tropical Variety Anders Nedergaard Jensen; Hannah Markwig; Thomas Markwig — 2008 Collectanea Mathematica
How to draw tropical planes. Herrmann, Sven; Jensen, Anders; Joswig, Michael; Sturmfels, Bernd — 2009 The Electronic Journal of Combinatorics [electronic only]