المؤلفون: Spence Bate F. R. S., C.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=od______2659::1190d0feccb68e4f36f3e5d7ce7dd949https://zenodo.org/record/2007107
URL الوصول: https://explore.openaire.eu/search/publication?articleId=od______2659::681e6c6c9b65116cafe432119eec11fbhttps://zenodo.org/record/1853666