5Hayami Y, Ruttan V W. Agricultural development : An international perspective [ M ]. The Johns Hopkins University Press, 1985:117 - 137.
6Gumbau Albert, Mercedes. Efficiency and technical progress : Sources of convergence in the Spanish regions [ J ]. Applied Eco- nomics, 2000,32:467 - 478.
7阎萍,郭宪.牦牛实用生产技术百问百答[M].北京:中国农业出版社,2013:25-28.
8Michaelidou A M. Factors influencing nutritional and health profile of milk and milk products [J]. Small Ruminant Re--search,2008,79 (1) :42--50.
9Wallis EJ, Ramsay LE, Hettiarachchi J. Combined inhibition of neutral endopeptidase and angiotensin- converting enzyme by samptrilant in essential hypertension[J]. Clin Pharmacol Ther,1998,64(4) :439--449.
10Yaniun Yang, Guaniun Tao, Ping Liu, et al. Peptide with angiotensin I-- conberting enzyme inhibitory activity from hydrolyzed corn glu- ten meal[J]. Journal of agricultural and food chemistry, 2007, 55:7891--7895.