On the other hand, DT of PV global publications displays an increasing trend from the rate of 0.82 to 5.78.
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The sentences
The mean values of degree of collaboration (DC), collaboration index (CI), collaboration coefficient (CC) and modified collaboration coefficient (MCC) during the selected period of study are 0.79, 2.74, 0.72, and 0.73, respectively which highly significant and indicates the better authorship collaborations.