*3.4.1.1 Article distribution by year of publication*

The earliest reports on the use of IoT in the libraries date back to 2016 (see **Figure 6**). The year 2019 saw the publication of the most articles (6), while the year 2016, 2017, and 2020 have the least publications (only 1 each year). The fact that


#### **Table 3.** *Review search results.*

*A Systematic Review on IoT-Based Smart Technologies for Seat Occupancy and Reservation… DOI: http://dx.doi.org/10.5772/intechopen.113329*

**Figure 6.** *Number of articles published per year.*

most of the articles were released between 2021 and 2022 indicates that this research field has recently attracted attention.
