You may also wish to search for items by John.
Only one matching reference was found.
Sabulal, B.; Dan, M.; John, A.; Kurup, R.; Chandrika, S.P.; George, V., Phenylbutanoid-rich rhizome oil of Zingiber neesanum from Western Ghats, southern India, Flavour Fragr. J., 2007, 22, 6, 521-524, https://doi.org/10.1002/ffj.1834 . [all data]