1. A review of the phenomenon and studies on emoticons: How play on symbols became science;Ptaszynski Michal;Journal of the Japanese Society for Artificial Intelligence,2017
2. Research trends of kaomoji analytics from engineering and psychological points of view;Okumura Noriyuki;Journal of the Japanese Society for Artificial Intelligence,2017
3. Effects of emoticons and pictograms on communication of emotional states via mobile text-messaging
4. Effects of emoticon with an apologetic message on the receiver's feelings;Arakawa Ayumu;Japanese Journal of Interpersonal and Social Psychology,2004
5. Influences of the emoticon and japanese small letters on the impression-evaluation of e-mail sentences;Taguchi Masanori;Journal of Informatics,2014