@ARTICLE{CsuDasVas_j2010_a, author = {Erzs\'ebet~Csuhaj-Varj\'u and J{\"u}rgen~Dassow and Gy{\"o}rgy~Vaszil}, title = {Variants of competence-based derivations in {CD} grammar systems}, journal = ijfcs, year = 2010, volume = {21}, number = {4}, pages = {549--569}, url = {http://dx.doi.org/10.1142/S0129054110007428} }