9OHSHIMA M, LAYUG D V, YOKOTA H. Effect of graded levels of ethoxyquin in alfalfa leaf extracts on carotenoid and cholesterol concentrations in chicks [ J ]. Animal Feed Science Technology, 1996,62 : 141 - 150.
10Galimand M, Gerbaud G, Courvalin P. Spectinomycin resistance in Neisseria spp. due to mutations in 16SrRNA [ J]. Antimicrob Agents Chemother, 2000,44 ( 5 ) : 1365 - 6.