Kato, S, Kato, Y, Usuki, K (担当:分担執筆, 範囲:Associations between dependency on Line text messaging and occurrence of negative emotions in Line group chats)
Kato, Y, Kato, S, Chida, K (担当:分担執筆, 範囲:Reply timing as emotional strategy in mobile text communications of Japanese young people: focusing on perceptual gaps between senders and recipients)
Kato, Y, Kato, S, Chida, K (担当:分担執筆, 範囲:Reply timing and emotional strategy in mobile text communications of Japanese young people: replies to messages conveying four different emotions)