While in the network in Figure 9, the co-citation degree from the literature on slices for each period of time were integrated and clustered. The integrated network consisted of 821 literatures and 2332 links to type a co-citation network cluster. A co-citation network diagram dependant on a photovoltaic building method https://bipv-technology04825.blog2freedom.com/31803212/helping-the-others-realize-the-advantages-of-bipv-technology