共 50 条
[27]
PHOSPHOGYPSUM AS A RAW-MATERIAL FOR PRODUCTION OF SULFURIC-ACID AND CEMENT CLINKER
[J].
PRZEMYSL CHEMICZNY,
1977, 56 (06)
:315-318
[30]
THE RAW-MATERIAL - PAPER
[J].
TEXTBOOKS IN THE DEVELOPING WORLD: ECONOMIC AND EDUCATIONAL CHOICES,
1989,
:102-112