Published in Gardens' Bulletin, Singapore, in 1974, in volume 27, issue 1, pages 123-129

Created: 2016-07-14, modified: 2016-07-14

Published in Gardens' Bulletin Singapore, in 1973, in volume 26, issue 2, pages 263-268

Created: 2018-12-17, modified: 2018-12-17

Published in Gardens' Bulletin Singapore, in 1991, in volume 43, issue 1, pages 27-38

Created: 2018-12-17, modified: 2018-12-17