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http://www.google.com/books?hl=zh-CN&lr=&id=JT8Qt-RtnqUC&oi=fnd&pg=PA93&dq=crop+livestock+%22economic+efficiency%22++%22allocative+efficiency%22&ots=MfnCaQYwer&sig=eru0ihNdTFi1lxJ2DmKPX8kyi3w#v=onepage&q=&f=false

别的链接不知了

2. Impact of land fragmentation on rice producers' technical efficiency in Southeast China Title Impact of land fragmentation on rice producers' technical efficiency in Southeast China
Authors  Tan, S.; Heerink, N.B.M.; Kuyvenhoven, A.; Qu Futian, --  
Date 2004
Type conference paper
Persistent IdentifierThe Persistent Identifiers (PI) is a number assigned to a digital object (for example a publication or dataset). By using the stable Uniform Resource Name (URN), objects will no longer be identified by the unstable Uniform Resource Locator (URL). The advantage is clear: when an object shifts to another repository, its URL will change, but its URN will remain the same. urn:nbn:nl:ui:32-341831
Publication http://library.wur.nl/WebQuery/wurpubs/341831
3.
Land fragmentation, resource use efficiency, and food crop security in Cameroon  
by Mbassa, Andre Nnoung, M.S., UNIVERSITY OF MARYLAND EASTERN SHORE, 1997, 111 pages; EP13972  
Advisor: Acquah, Emmanuel T.
School: UNIVERSITY OF MARYLAND EASTERN SHORE
Source: MAI 43/06, p. 2170, Dec 2005
Source Type: M.S.
Subjects: Environmental science; Agronomy; Welfare
Publication Number: EP13972
http://proquest.umi.com/pqdlink?Ver=1&Exp=01-22-2015&FMT=7&DID=932451601&RQT=309&attempt=1&cfc=1