Table 6 Main research themes in each... | Emerald Publishing

Table 6

Main research themes in each cluster

No. of cluster	Main theme	Exemplary studies
1	Green public procurement (GPP)	Cheng et al. (2018), De Giacomo et al. (2019), Grandia et al. (2015), Igarashi et al. (2015), Krieger and Zipperer (2022), Lindström et al. (2022), Liu et al. (2019a), Liu et al. (2019b)
2	Corruption and PP	Blanc-Brude (2013), Busu and Busu (2021), Chiappinelli (2020), D’Alpaos et al. (2013), Detkova et al. (2018), Estache and Iimi (2010), Gallego et al. (2021), Gani (2017)
3	The role of SMEs in PP	Ancarani et al. (2019), Fayos et al. (2022), Flynn (2017), Flynn et al. (2015), Flynn and Davis (2016, 2017), García et al. (2018), Glas and Eßig (2018)
4	Electronic PP	Aboelazm (2022), Afolabi et al. (2022), Al-Aama (2012), Dlakuseni et al. (2018), Fleming et al. (2010), Haim Faridian (2015), Lee (2019)
5	Innovation and PP	Amann and Essig (2015), Bleda and Chicot (2020), Caloghirou et al. (2016), Ghisetti (2017), Lember et al. (2015), Lenderink et al. (2022), Saastamoinen et al. (2018)
6	Labour standards	Benjamin (2020), Holley (2014), Holley et al. (2015), Howe and Landau (2009), Jaehrling et al. (2018), Sack and Sarter (2018)
7	Service acquisition	Crowder (2015), Moe et al. (2017), Nazari et al. (2017), Schiele (2005, 2007), Schiele and McCue (2006, 2010)

No. of cluster	Main theme	Exemplary studies
1	Green public procurement (GPP)	Cheng et al. (2018), De Giacomo et al. (2019), Grandia et al. (2015), Igarashi et al. (2015), Krieger and Zipperer (2022), Lindström et al. (2022), Liu et al. (2019a), Liu et al. (2019b)
2	Corruption and PP	Blanc-Brude (2013), Busu and Busu (2021), Chiappinelli (2020), D’Alpaos et al. (2013), Detkova et al. (2018), Estache and Iimi (2010), Gallego et al. (2021), Gani (2017)
3	The role of SMEs in PP	Ancarani et al. (2019), Fayos et al. (2022), Flynn (2017), Flynn et al. (2015), Flynn and Davis (2016, 2017), García et al. (2018), Glas and Eßig (2018)
4	Electronic PP	Aboelazm (2022), Afolabi et al. (2022), Al-Aama (2012), Dlakuseni et al. (2018), Fleming et al. (2010), Haim Faridian (2015), Lee (2019)
5	Innovation and PP	Amann and Essig (2015), Bleda and Chicot (2020), Caloghirou et al. (2016), Ghisetti (2017), Lember et al. (2015), Lenderink et al. (2022), Saastamoinen et al. (2018)
6	Labour standards	Benjamin (2020), Holley (2014), Holley et al. (2015), Howe and Landau (2009), Jaehrling et al. (2018), Sack and Sarter (2018)
7	Service acquisition	Crowder (2015), Moe et al. (2017), Nazari et al. (2017), Schiele (2005, 2007), Schiele and McCue (2006, 2010)