@article{https://resolver.caltech.edu/CaltechAUTHORS:20170712-111147439, title = "Persistent Topology of Syntax", journal = "Mathematics in Computer Science", year = "2018", url = "https://resolver.caltech.edu/CaltechAUTHORS:20170712-111147439", id = "record", issn = "1661-8270", doi = "10.1007/s11786-017-0329-x", volume = "12" }