Number of articles citing the ISO standards on biomimetics. The ISO standards 18458 and 18459 were published in 2015 and ISO 18457 in 2016. ISO 18458, ‘Biomimetics – terminology, concepts and methodology (n = 37); ISO 18459, ‘Biomimetics – biomimetic structural optimization’ (n = 15); ISO 18457, biomimetics – biomimetic materials, structures and components’ (n = 7). n refers to the number of articles citing the specific ISO standard. The number of overall identified articles is 43, as one article can cite one to all three standards