@techreport{haa04:minsum1,
address = {Espoo, Finland},
author = {Harri Haanp{\"a}{\"a}},
institution = {Helsinki University of Technology, Laboratory for Theoretical Computer Science},
month = {February},
number = {A88},
pages = {9},
title = {Minimum Sum and Difference Covers of {A}belian Groups},
type = {Research Report},
year = {2004},
}