[4] Buck J L[M]. Land utilization in China(1937).
[15] Demetriou D, Stillwell J, See L. A new methodology for measuring land fragmentation[J]. Computers Environment & Urban Systems, 39, 71-80(2013).
[24] Simmons A J. An index of farm structure, with a Nottinghamshire example[J]. East Midlands Geographer, 3, 255-261(1964).