## 3 Results and Discussion
### Most Relevant Sources  
In bibliometric analysis, subject categories and journals are regarded as fundamental units needed to explain research scope distributions in a particular topic of discourse [50]. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Author** & **h\_index** & **TC** & **NP** \\ \hline [PERSON] & 10 & 331 & 14 \\ [PERSON] & 9 & 460 & 13 \\ [PERSON] & 6 & 137 & 8 \\ [PERSON] & 6 & 208 & 7 \\ [PERSON] & 4 & 122 & 6 \\ [PERSON] & 5 & 72 & 6 \\ [PERSON] & 4 & 69 & 5 \\ [PERSON] & 5 & 60 & 5 \\ [PERSON] & 5 & 302 & 5 \\ [PERSON] & 5 & 160 & 5 \\ [PERSON] & 4 & 44 & 4 \\ [PERSON] & 3 & 90 & 4 \\ [PERSON] & 3 & 47 & 4 \\ [PERSON] & 4 & 835 & 4 \\ [PERSON] & 2 & 47 & 4 \\ [PERSON] & 4 & 107 & 4 \\ [PERSON] & 3 & 108 & 4 \\ [PERSON] [PERSON] & 4 & 202 & 4 \\ [PERSON] & 4 & 211 & 4 \\ [PERSON] & 4 & 116 & 4 \\ \hline \hline \end{tabular} NP: Number of Publications; TC: Total Citations.  
\end{table} 
Table 2: Most relevant authors between 2011 and 2020. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Affiliations** & **Articles** & **Country** & **Organization Type** \\ \hline Univ Konstanz & 41 & Germany & University \\ Duke Univ & 37 & USA & University \\ Univ Washington & 24 & USA & University \\ Harvard Univ & 23 & USA & University \\ Univ Calif Davis & 18 & USA & University \\ Boston Univ & 14 & USA & University \\ Harvard Med Sch & 13 & USA & Medical School \\ Natl Hlth and Environm Effects Res Lab & 13 & USA & Research Laboratory \\ Univ Brasilia & 13 & Brazil & University \\ Univ Fed Santa Catarina & 13 & Brazil & University \\ Columbia Univ & 12 & USA & University \\ Penn State Univ & 11 & USA & University \\ Res Triangle Pk & 11 & USA & Research Park \\ Univ Calif San Diego & 11 & USA & University \\ Albert Einstein Coll Med & 10 & USA & College of Medicine \\ Ctr Dis Control And Prevent & 10 & USA & National Public Health Agency \\ Fujian Med Univ & 9 & China & Medical University \\ Icahn Sch Med Mt Sinai & 9 & USA & Private Medical School \\ Inst Hlth and Consumer Protect & 9 & Italy & Joint Research Centre \\ Univ Cincinnati & 9 & USA & University \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Top 20 relevant organizations from 2011 to 2020. In this study, the sources (journals) where researchers in this scientific field published their works (especially as it concerns neurotoxicants, their environmental impacts, and attendant neurologic disorders) were evaluated. This included the journal impact factors, the number of articles published in each journal, and the number of citations received by individual publications. The 20 most impactful journals in this field are listed in Table 4. The h-index and impact factors (IFs) of the 20 journals varied from 2 for \"environmental pollution\" to 15 for \"neurotoxicology\" and from 1.902 for \"toxicologic pathology\" to 9.621 for \"environment international\", respectively. The first seven journals on the list are Neurotoxicology, Toxicological Sciences, Neurotoxicology and Teratology, Toxicology, Archives of Toxicology, Environmental Health Perspectives, and Toxicology and Applied Pharmacology. They all recorded 29 (9.03%), 18 (5.61%), 17 (5.30%), 12 (3.74%), 11 (3.43%), 8 (2.49%), and 8 (2.49%) articles published within the specified period (2011-2020), respectively, with corresponding citations of 722, 265, 428, 283, 430, 636, and 377 citations, respectively. This ranking was consistent with Bradford law, which also grouped the top 20 journal sources into two zones, with the first eight falling into zone 1 and the other 12 belonging to zone 2, according to their levels of relevance in the field [51,52]. Even though it may not be considered the best index for evaluating an author's impact in a certain field, citations are an important parameter in bibliometric analysis, as it builds up over several years. Hence, recently published articles may have fewer citations compared to those published many years earlier [37,53,54].