@phdthesis{oai:tsukuba.repo.nii.ac.jp:00008526,
 author = {Kim, Hak Yoon and 金, 學潤},
 month = {},
 note = {The Earth is about 4.6 X 109 years old.At the early time, the Earth was irradiated with strong sunlight including short-wavelength ultraviolet
(UV) radiation. With the strong UV radiation ..., 1995},
 school = {筑波大学, University of Tsukuba},
 title = {Effects of enhanced ultraviolet-B radiation on growth and protection mechanisms in rice (Oryza sativa L.) plants},
 year = {1996}
}