KAMATA, K. Sign language conversation through videophone in ISDN service. Proc. of European Conference on the Advancement of Rehabilitation Technology 2(ECART2).28.2, Stockholm. 1993
KAMATA, K. The use of 64 Kb/s videophones for hearing impaired people. Proc. of 15th International Symposium on Human Factors in Telecommunication (HFT'95). 1995, 321-328