@phdthesis{oai:tsukuba.repo.nii.ac.jp:00008434,
 author = {Kawamura, Kazuhiro},
 month = {},
 note = {The concept of span of continua (=compact connected metric spaces) was introduced by A. Lelek in 1964. He posed some problems on continua with zero span. They are related to the characterization problem of arc-like continua among tree-like continua and are important in continua theory. At present, these problems are still open. But, in this thesis, we prove some results conserning these problems., 1990},
 school = {筑波大学, University of Tsukuba},
 title = {On spans of continua},
 year = {1991}
}