http://search.cnki.net/down/default.aspx?filename=DKXX200703000&dbcode=CJFD&year=2007&dflag=pdfdown
search.cnki.net
全网免费
http://bib.irb.hr/datoteka/868506.Geo-spaatial_Inf_Science.pdf
bib.irb.hr
全网免费
http://www.tandfonline.com/doi/pdf/10.1007/BF02826900?needAccess=true
Taylor & Francis
全网免费
http://www.cqvip.com/main/confirm.aspx?id=28093236
维普网
全网免费