@article{DasMit_j1999_c, author = {J{\"u}rgen~Dassow and Victor~Mitrana}, title = {Stack Cooperation in Multistack Pushdown Automata}, journal = jcss, volume = {58}, number = {3}, year = {1999}, pages = {611--621}, url = {http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WJ0-45GMWM0-Y-1&_cdi=6864&_user=1908389&_orig=search&_coverDate=06%2F30%2F1999&_sk=999419996&view=c&wchp=dGLbVzb-zSkWW&md5=86e1e4aafc66a44bdeb36f7c28940be2&ie=/sdarticle.pdf} }