5Harrison C, Burgess J. Accessible Natural Greenspace in Towns and Cities: A Review of Appropriate Size and Dis tance Criteria. London: English Nature, 1995.
6J. T. Betts,P. D. Frank. A sparse nonlinear optimization algorithm[J] 1994,Journal of Optimization Theory and Applications(3):519~541
7R. H. Nickel,J. W. Tolle. A sparse sequential quadratic programming algorithm[J] 1989,Journal of Optimization Theory and Applications(3):453~473