Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 1-41

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 43-54

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 55-69

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 71-84

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 85-98

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 99-102

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 103-118

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 119-124

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 125-126

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 127-139

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 141-150

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 151-161

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 163-174

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 175-177

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 179-182

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 183-256

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 257-308

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 309-317

Published in Gardens' Bulletin, Singapore, in 1999, in volume 51, issue 1, pages 319-320

Published in Gardens' Bulletin Singapore, in 1999, in volume 51, issue 2, pages 321