Havinga, Reinout, and Havard Ostgaard. “Barcodes Are Dead, Long Live Barcodes! : Improving the Inventory of Living Plant Collections Using Optical Technology”. Sibbaldia: The International Journal of Botanic Garden Horticulture, no. 14, Jan. 2017, pp. 133-40, doi:10.24823/Sibbaldia.2016.196.