@article{Homeister2003, author = {Homeister, Matthias}, title = {Lower Bounds for the Sum of Graph--driven Read--Once Parity Branching Programs}, series = {Electronic colloquium on computational complexity : ECCC : research reports, surveys and books in computational complexity}, journal = {Electronic colloquium on computational complexity : ECCC : research reports, surveys and books in computational complexity}, number = {Report No. 68}, issn = {1433-8092}, pages = {15}, year = {2003}, language = {en} }