S. M. Feroz and  K. Yoshimura and  A. Hagihara,  Architectural Stratification and Woody Species Diversity of a Subtropical Forest Grown in a Limestone Habitat in Okinawa Island, Japan.   journal   = {International Journal of Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2008, vol. 23(11). 361 - 366
    [viewed 09 December 2019]. Available from: https://publications.waset.org/pdf/7874.