@techreport{weko_66103_1,
   author	 = "Katsuhisa,Yamanaka and Shin-ichiNakano",
   title	 = "Efficient Enumeration of All Ladder Lotteries with k Bars",
   year 	 = "2009",
   institution	 = "Graduate School of Information Systems, The University of Electro-Communications, Department of Computer Science, Gunma University",
   number	 = "1",
   month	 = "sep"
}