Published in Philippine Daily Inquirer (1999)

Published in Perspectives (1999)

Published in Journal on Environment, Energy and Minerals (1999)

Published in Journal on Environment, Energy and Minerals (1999)

Published in Journal on Environment, Energy and Minerals (1999)

Published in Journal on Environment, Energy and Minerals (1999)

Published in Journal on Environment, Energy and Minerals (1999)

Published 1998

Published 1998

Published in Philippine Daily Inquirer (1998)