@inproceedings{weko_231366_1,
   author	 = "Miura,Takeshi",
   title	 = "Quantitative Evaluation of Local Distortion in Historical Maps by Using the Nabla Operator",
   booktitle	 = "じんもんこん2023論文集",
   year 	 = "2023",
   volume	 = "2023",
   number	 = "",
   pages	 = "219--224",
   month	 = "dec"
}