@article{https://authors.library.caltech.edu/records/0wq4z-dv964, author = "Fuller, F. Brock", title = "The writhing number of a space curve", year = "1971", url = "https://resolver.caltech.edu/CaltechAUTHORS:FULpnas71", id = "https://authors.library.caltech.edu/records/0wq4z-dv964", issn = "0027-8424", volume = "68", number = "4", pages = "815-819" }