Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 1-4

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 5-30

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 31-34

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 35-37

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 39-41

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 43-48

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 49-57

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 59-81

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 83-98

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 99-114

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 115-119

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 121-122

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 123-124

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 125-150

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 161-169

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 171-183

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 185-196

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 197-219

Published in Gardens' Bulletin, Singapore, in 1998, in volume 50, issue 1, pages 221-334

Published in Gardens' Bulletin Singapore, in 1998, in volume 50, issue 2, pages 335-336