@Article{FerSti_j2002, author = {Henning~Fernau and Ralf~Stiebe}, title = {Sequential Grammars and Automata with Valences}, journal = tcs, year = 2002, volume = 276, number = {1/2}, pages = {377--405}, url = {http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6V1G-45J5JSM-K-6&_cdi=5674&_user=1896239&_orig=search&_coverDate=04%2F06%2F2002&_sk=997239998&view=c&wchp=dGLbVzb-zSkWA&md5=2c084f6b8c2d9e99664fc77d89f7be08&ie=/sdarticle.pdf} }