@ARTICLE{DasPauSal_j1993_b, author = {J{\"u}rgen~Dassow and Gheorghe~P\u{a}un and Arto~Salomaa}, title = {Grammars based on patterns}, journal = ijfcs, year = 1993, volume = 4, number = {1}, pages = {1--14}, url = {http://dx.doi.org/10.1142/S012905419300002X} }