Table 2. Shows the data sources of the Spark-based clustering papers.

Data source	Paper
IEEE Explorer	Dave & Gianey (2016), Hu et al. (2018), Fasheng & Xiong (2011), Ajin & Kumar (2016), Verma, Mansuri & Jain (2016), Xin et al. (2013), Xu & Tian (2015), Manwal & Gupta (2017), Shanjiang et al. (2018), Wang et al. (2016), Sinha & Jana (2016), Kusuma et al. (2016), Backhoff & Ntoutsi (2016), Ding et al. (2017), Sarazin, Lebbah & Azzag (2014), Ben HajKacem, Ben N’Cir & Essoussi (2017), Wu et al. (2017), Zayani, Ben N’Cir & Essoussi (2016), Chitrakar & Petrovic (2018), Win et al. (2019b), Liu et al. (2019), Solaimani et al. (2014), Chakravorty et al. (2014), Lighari & Hussain (2017), Jin et al. (2015), Guo, Zhang & Zhang (2016), Solaimani et al. (0000), Lee & Kim (2018), Hassani et al. (2016), Sarazin, Azzag & Lebbah (2014), Luo et al. (2016), Han et al. (2018b), Aryal & Wang (2018), Liang et al. (2017), Sherar & Zulkernine (2017), Wang & Qian (2018), Sarazin, Azzag & Lebbah (2014b)
Elsevier	Bhadani & Jothimani (2016), Ben HajKacem, Ben N’Cir & Essoussi (2017), Rui et al. (2017)
Springer	Othman et al. (2018), Baltas, Kanavos & Tsakalidis (0000), Zerhari, Lahcen & Mouline (2015), Rujal & Dabhi (2016), Sood, Akshay & Singh (2019), Ketu & Agarwal (2015), Santhi & Jose (2018), Jain (2010), Huang (1998), Ben HajKacem, Ben N’cir & Essoussi (0000), Win et al. (2019a), Gao & Zhang (2017), Pang et al. (0000), Mallios et al. (0000), Thakur & Dharavath (2018), Kamaruddin, Ravi & Mayank (0000), Han et al. (2018a), Corizzo et al. (2019), Zhou & Wang (0000), Gong, Sinnott & Rimba (0000), Bonab et al. (2015)
Google Scholar	Kim (2018), Sharma, Shokeen & Mathur (2016), Gousios (2018), Aziz, Zaidouni & Bellafkih (0000), Mishra, Pathan & Murthy (2018), Jiang et al. (2010), Shobanadevi & Maragatham (2017), Lavanya, Sairabanu & Jain (2019), Kim et al. (2018), Lulli, Dell’Amico & Ricci (2016), Hasan et al. (2019)
ResearchGate	Shoro & Soomro (2015), Salloum et al. (2016), Assefi et al. (2017), Armbrust et al. (2015), Hosseini & Kiani (2018), Hartigan, Wong & Algorithm (1979), Shah (2016), Fatta & Al Ghamdi (2019), Sarazin, Azzag & Lebbah (2014b)
Science Direct	Labrinidis & Jagadish (2012), Shirkhorshidi et al. (0000), Rotsnarani & Mrutyunjaya (2015), Huang et al. (2017), Zhang et al. (2019), Maheshwar & Haritha (2016), Ianni et al. (2020), Malondkar et al. (2019), Rui et al. (2017), Hosseini & Kourosh (2019)