@ARTICLE{Sti_j2008_art, Author = {Ralf~Stiebe}, Title = {Slender Siromoney matrix languages}, Journal = ic, Year = 2008, Volume = 206, Number = {9/10}, Pages = {1248--1258}, url = {http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WGK-4SPJ1SS-2-1&_cdi=6825&_user=1908389&_orig=browse&_coverDate=10%2F31%2F2008&_sk=997939990&view=c&wchp=dGLbVzb-zSkWb&md5=1056da729e4010a1028b0b12498a6352&ie=/sdarticle.pdf} }