@article{weko_60136_1,
   author	 = "Kiyohiro,Shikano and Jun-IchiroToriwaki and Teruo,Fukumura",
   title	 = "Properties of Wave Propagation Method for Conversion of Gray Pictures into Line Figures",
   journal	 = "Information Processing in Japan",
   year 	 = "1974",
   volume	 = "14",
   number	 = "0",
   pages	 = "1--6",
   month	 = "jan"
}