@techreport{weko_80302_1,
   author	 = "Katsuhisa,Yamanaka",
   title	 = "A Compact Encoding of Rooted Trees",
   year 	 = "2012",
   institution	 = "Department of Electrical Engineering and Computer Science, Iwate University",
   number	 = "4",
   month	 = "jan"
}