author = {C. Schneider},
title = {{A Refined Difference Field Theory and Optimal Nested Sum Representations}},
language = {english},
year = {2009},
month = {19. July},
note = {Invited talk at Summation/Integration/Differential/Difference Equations Workshop 2009},
institution = {RISC, J. Kepler University Linz, Hagenberg},
conferencename = {Summation/Integration/Differential/Difference Equations Workshop 2009}