A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
Daniel König, Markus Lohrey, Georg Zetzsche. "Knapsack and subset sum problems in nilpotent, polycyclic, and co-context-free groups." Contemporary Mathematics (2016) 129-144