@ARTICLE{Das_j1982_a, author = {J{\"u}rgen~Dassow}, title = {Grammars with valuations -- a discrete model for self-organization of biopolymers}, journal = dam, year = 1982, volume = 4, number = 3, pages = {161--174}, url = {http://dx.doi.org/10.1016/0166-218X(82)90036-1} }