@ARTICLE{Das_j1980_a, author = {J{\"u}rgen~Dassow}, title = {On some extensions of {I}ndian parallel context-free grammars}, journal = actacybern, year = 1980, volume = 4, number = 4, pages = {303--310}, url = {http://www.inf.u-szeged.hu/actacybernetica/prevvols/4_4/4_4.pdf} }