1. Singapore — A city of opportunities and challenges;Broms,1989
2. Potential use of underground caverns in Singapore;Broms,1993
3. A review of large permanent rock cavern in France;Duffaut,1986
4. A Triassic limestone (“Pandan Limestone”) discovered by drilling at Singapore;Fontaine;CCOP Newsletter,1993
5. Weathering and engineering properties of carbonate rocks in Singapore;Guo,1998