dunham improved
there is an improved version of Dunham's original algorithm here https://www.d.umn.edu/~ddunham/dunisam07.pdf [DUN07], as well as slightly modified, here: https://www.d.umn.edu/~ddunham/eccad09.pdf [DUN09]
It has been implemented by a Bachelor student, several years ago [VR12] (http://von-raumer.de/academic/ba_vonraumer.pdf). In this thesis, we find a statement, that the algorithm is free of duplicates, as the lattice is built via independent hierachical trees.