1. A primer on sequence methods;A Abbott;Organization Science,1990
2. Indexed Grammars---An Extension of Context-Free Grammars;A V Aho;Journal of the ACM,1968
3. A Categorical-Generative Theory of Social Processes: Towards the Ontological and Mathematical Foundations of a Grammar-Based Model for Qualitative Research;B Braga;Computer Supported Qualitative Research. ISQR 2017. Advances in Intelligent Systems and Computing,2018