7Tamura N, Hayashi F. Five-year study of the genetic structure and demography of two subpopulations of the Japanese squirrel ( Sciurus lis ) in a continuous forest and an isolated woodlot. Ecological Research ,2007,22(2) :261 - 267.
8Hale M L, Lurz P W W. Morphological changes in a British mammal as a result of introductions and changes in landscape management: the red squirrel (Sciurus vulgaris ). Journal of Zoology ,2003,260(2) : 159 - 167.
9Koprowski J L.The response of tree squirrels to fragmentation: a review and synthesis. Animal Conservation, 2005,8 (4) : 369 376.
10Rodriguez A, Andren H. A comparison of Eurasian red squirrel distribution in different fragmented landscapes. Journal of Applied Ecology, 1999,36 ( 5 ) : 649 - 662.