Present work

Fathizadeh et al. [14]

Hayat et al. [9]

Mehmood et al. [11]

Ghotbi [10]

Pavlov [12]

−1.0000000

−1.00000

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1

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10

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15

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50

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100

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500

−31.6385840

−31.6386

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−31.63858

1000