Table 5. Number of referecnes for DMUs with eco-efficiency of 1

Efficient DMU	Number of references	Referenced DMUs
DH04	18	DH01, DH02, DH03, DH04, DH05, DH06, DH07, DH08, DH09, DH10, DH11, DH12, DH13, DH14, DH15, DH17, DH18, DH19
DH20	15	DH01, DH02, DH03, DH05, DH07, DH08, DH09, DH10, DH12, DH14, DH15, DH17, DH18, DH19, DH20
DH16	13	DH01, DH02, DH03, DH07, DH08, DH09, DH11, DH12, DH14, DH15, DH16, DH17, DH19