Published in Gardens' Bulletin Singapore, in 1993, in volume 45, issue 1, pages 1-287

Published in Gardens' Bulletin Singapore, in 1993, in volume 45, issue 1, pages 289-290

Published in Gardens' Bulletin Singapore, in 1993, in volume 45, issue 1, pages 290-291

Published in Gardens' Bulletin Singapore, in 1993, in volume 45, issue 2, pages 293-335

Published in Gardens' Bulletin Singapore, in 1993, in volume 45, issue 2, pages 337-357

Published in Gardens' Bulletin Singapore, in 1993, in volume 45, issue 2, pages 359-381

Published in Gardens' Bulletin Singapore, in 1993, in volume 45, issue 2, pages 383-384