@techreport{weko_78468_1, author = "Takeaki,Uno and Ryuhei,Uehara and Shin-ichiNakano", title = "On the number of reduced trees, cographs, and series-parallel graphs by compression", year = "2011", institution = "国立情報学研究所, 北陸先端科学技術大学院大学, 群馬大学", number = "6", month = "nov" }