Prospect of environmental administration in 1999. Present state and future problems of sewage improvement.
1999 ◽
Vol 28
(1)
◽
pp. 32-39
1998 ◽
Vol 27
(1)
◽
pp. 67-70
1995 ◽
Vol 24
(1)
◽
pp. 20-25
1996 ◽
Vol 25
(1)
◽
pp. 49-54
1995 ◽
Vol 24
(1)
◽
pp. 15-19
1999 ◽
Vol 28
(1)
◽
pp. 22-27
1995 ◽
Vol 24
(1)
◽
pp. 58-62
1996 ◽
Vol 25
(1)
◽
pp. 55-59
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