@phdthesis{oai:tsukuba.repo.nii.ac.jp:00008286,
 author = {井田, 仁康 and Ida, Yoshiyasu},
 month = {},
 note = {Chapter 1 Introduction I-1 Previous studies Regular air service in Japan was begun on 1922 or  1923 by Japan Air Transport Institute (Sakai-Tokushima), East and West Regular Air Service (Tokyo-Osaka) and Japan Air Lines (Osaka-Beppu) (Kimura and Masui, 1979). ..., 1991},
 school = {筑波大学, University of Tsukuba},
 title = {A study on regional differences of air passenger flow patterns and the cause of the regional differnces},
 year = {1992}
}