13

Ghanbari, Farshad and Rieke [17]

2.0018

2.0018

1.9825

2.1063

2.0231

0.3776

3

Buzzelli [16]

2.0160

1.9813

2.0708

2.1527

2.0552

0.3836

19

This study

2.0828

2.0082

2.0730

2.1669

2.0827

0.3883

11

Haaland [22]

2.0833

2.0080

2.2566

2.0259

2.0935

0.3907

16

Brkić [26]

2.0687

2.1409

2.1994

2.1103

2.1298

0.3974

12

Manadilli [23]

2.1511

1.9947

2.3941

2.0287

2.1421

0.3998

18

Rao and Kumar [27]

2.2285

2.4316

2.1779

2.0146

2.2131

0.4130

15

Round [25]

2.5790

2.1902

2.2479

2.1139

2.2828

0.4260

10

Sonnad and Goudar [21]

2.7362

2.71272

2.7368

2.7202

2.7264

0.5088

9

Shakham [20]

3.921

4.1258

4.1667

4.1146

4.082

0.7650

6

Chen [11]

4.3073

4.1367

3.9977

4.1984

4.1601

0.7763

7

Barr [19]

4.5447

4.2223

4.1907

4.3816

4.3348

0.8090

5

Romeo, Royo and Monzon [9]

6.0524

6.2378

6.0786

6.0439

6.1032

1.1390

2

Serghides [15]

6.0707

6.1784

6.1017

6.1326

6.1334

1.1447

4

Zigrang and Sylvester [14]

6.8008

6.0883

6.9692

6.3390

6.5493

1.2222