Half K3 surfaces

          @misc{ scivideos_strings:20021041,
            doi = {},
            url = {https://scivideos.org/strings-conferences/20021041},
            author = {},
            keywords = {},
            language = {en},
            title = {Half K3 surfaces},
            publisher = {},
            year = {},
            month = {},
            note = {strings:20021041 see, \url{https://scivideos.org/strings-conferences/20021041}}
          }