TY - Journal of Communications and Information Networks A1 - T1 - Y1 - 2019-07-19 00:00:00.0 JF - Journal of Communications and Information Networks JO - Journal of Communications and Information Networks SP - 52 EP - 65 VL - 1 IS - 4 UR - {https://www.infocomm-journal.com/jcin/CN/10.1007/BF03391580} N1 - 10.1007/BF03391580 ER -