共 69 条
[2]
[Anonymous], 2015, Population
[3]
[Anonymous], 2010, Guide for the care and use of agricultural animals in teaching and research, V3rd, P74
[4]
[Anonymous], 2002, NLOGIT VERSION 3 0 R
[5]
Barret R., 2013, MILWAUKEE J SENTINEL
[9]
Carlsson F., 2007, Journal of Agricultural and Applied Economics, V39, P61