Figure 2: Distribution of papers selected by journals
Source : authors
It is emphasized that the periodicals: Procedia - Social and Behavioral Sciences and Transportation Research Procedia are open access products focusing entirely on publishing full sets of conference proceedings. Thus, the greatest number of papers observed was, in a sense, expected.

Stage 2.3: extracting data and information’

\label{stage-2.3-extracting-data-and-information}
Figure 3 illustrates the year of publication of all papers included in this systematic literature review. In relation to the time span, there was a concentration of publications in 2014 (10) and 2015 (9). It should be noted that the number of publications in 2016 only considers papers published until the month of July (date of the survey). This observation may justify the smaller number of papers published (5) in that year.
No papers related to this theme were published in 2012. This result corroborates with the premise adopted in this paper that the study of the technologies related to the last mile delivery in urban areas is a recent approach, and thus it ratifies the restriction of the search for the last five years.