@article{weko_60134_1,
   author	 = "Issei,Yamasaki",
   title	 = "A Method for Two-valuing of Printed Images",
   journal	 = "Information Processing in Japan",
   year 	 = "1975",
   volume	 = "15",
   number	 = "0",
   pages	 = "152--157",
   month	 = "jan"
}