Published in Gardens' Bulletin, Singapore, in 1988, in volume 41, issue 1, pages 1-9

Published in Gardens' Bulletin, Singapore, in 1988, in volume 41, issue 1, pages 11-18

Published in Gardens' Bulletin, Singapore, in 1988, in volume 41, issue 1, pages 19-28

Published in Gardens' Bulletin, Singapore, in 1988, in volume 41, issue 1, pages 59-81

Published in Gardens' Bulletin, Singapore, in 1988, in volume 41, issue 2, pages 29-41

Published in Gardens' Bulletin, Singapore, in 1988, in volume 41, issue 2, pages 43-44

Published in Gardens' Bulletin, Singapore, in 1988, in volume 41, issue 2, pages 45-48

Published in Gardens' Bulletin, Singapore, in 1988, in volume 41, issue 2, pages 49-58

Published in Gardens' Bulletin, Singapore, in 1988, in volume 41, issue 2, pages 83-91

Published in Gardens' Bulletin, Singapore, in 1988, in volume 41, issue 2, pages 93-94

Published in Gardens' Bulletin, Singapore, in 1988, in volume 41, issue 2, pages 95