@Article{ItoDasSti_j2002, author = {Masami~Ito and J{\"u}rgen~Dassow and Ralf~Stiebe}, title = {Some Remarks on Codes Defined by {P}etri Nets}, journal = jucs, year = 2002, volume = 8, number = 2, pages = {260--269}, url = {http://www.jucs.org/jucs_8_2/some_remarks_on_codes/Ito_M_1.pdf} }