(1)吕风华,大氮肥,1,29 (1985)
(2)张凤英,大氮肥,1,25(1983)
(3)P.BrUIS.etal,PUrificatien of Urea Plant Waste Water to Extremely Low LeTels
(4)C.A.57:44125C
(5)EUr.Pat.APPL.EP 59,519(1982)
(8)Onacannae hIso6pereana IC asropcxoby CenRe:en6czey,732212(1980)
(7)大氮肥、(增刊1)37(1983)
(8)中国石化总公司与意大利斯那姆公司合成氮/尿素技术交流资料(1984)
(9)chemical week,119,14,25(1976)
(10)U.S.P.4,087,513(1978)
(11)U.S.P.4,168,299(11978)
(12)U.S.P.4,220,835(1980)
(13)C.A.99:181051e
(14)日本公开特许公报,昭53-80399
(15)C.A.99;107542z
(16)C.A.93:53340n
(17] C.A.93:1731738
[18] 川化,1(1985)
[19] 王文善,大氮肥 1,8(1985)
[20] U.S.P.4,327,068(1982)