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 title        = "Parallel Grammars: A Phenomenology",
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@inproceedings(FerFre96,
 author       = "H. Fernau and R. Freund",
 year         = "1996",
 title        = "Bounded parallelism in array grammars used for character recognition",
 editor       = "P. Perner and P. Wang and A. Rosenfeld",
 booktitle    = "Advances in Structural and Syntactical Pattern Recognition (Proceedings of the SSPR'96)",
 series       = "Lecture Notes in Computer Science",
 volume       = "1121",
 publisher    = "Springer",
 pages        = "40--49",
 doi          = "10.1007/3-540-61577-6\_5",
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@techreport(FerFreHol96,
 author       = "H. Fernau and R. Freund and M. Holzer",
 year         = "1996",
 title        = "External versus Internal Hybridization for Cooperating Distributed Grammar Systems",
 type         = "Technical Report",
 number       = "TR 185--2/FR--1/96",
 institution  = "Technische Universit{\"a}t Wien (Austria)",
)
@article(FerFreHol01,
 author       = "H. Fernau and R. Freund and M. Holzer",
 year         = "2001",
 title        = "Hybrid modes in cooperating distributed grammar systems: internal versus external hybridization",
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 title        = "Hybrid modes in cooperating distributed grammar systems: combining the $t$-mode with the modes $\leq k$ and $= k$",
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 doi          = "10.1016/S0304-3975(02)00541-8",
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 author       = "H. Fernau and M. Holzer",
 year         = "1996",
 title        = "Accepting multi-agent systems {II}",
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 author       = "H. Fernau and M. Holzer",
 year         = "1997",
 title        = "Conditional context-free languages of finite index",
 editor       = "Gh. P{\u a}un and A. Salomaa",
 booktitle    = "New Trends in Formal Languages",
 series       = "Lecture Notes in Computer Science",
 volume       = "1218",
 publisher    = "Springer",
 pages        = "10--26",
 doi          = "10.1007/3-540-62844-4\_2",
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@inproceedings(MeeRoz78,
 author       = "R. Meersman and G. Rozenberg",
 year         = "1978",
 title        = "Cooperating grammar systems",
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 series       = "Lecture Notes in Computer Science",
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 publisher    = "Springer",
 pages        = "364--374",
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@article(Mit93,
 author       = "V. Mitrana",
 year         = "1993",
 title        = "Hybrid cooperating/distributed grammar systems",
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 year         = "1994",
 title        = "On the generative capacity of hybrid {CD} grammar systems",
 journal      = "J. Inf. Process. Cybern. EIK (formerly Elektron. Inf.verarb. Kybern.)",
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 editor       = "G. Rozenberg and A. Salomaa",
 year         = "1997",
 title        = "Handbook of Formal Languages, 3 volumes",
 publisher    = "Springer, Berlin",
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 year         = "1978",
 title        = "On the effect of the finite index restriction on several families of grammars; {P}art 2: context dependent systems and grammars",
 journal      = "Foundations of Control Engineering",
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 pages        = "126--142",
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