Algorithm 1. Improved central node selection.

1 Calculate the all influence of nodes

2 For each $v\in V$ do

3  $ALL\left(v\right)={\displaystyle \sum _{\begin{array}{l}{v}_n\in N(v)\\ v_n\ne v\end{array}}IB(v,v_n)}={\displaystyle \sum _{\begin{array}{l}{v}_n\in N(v)\\ v_n\ne v\end{array}}\frac{D(v)\times D(v_n)}{{(1-SIM(v,v_n))}^2}}$

4 End for

5 Central node selection with CMI

6 For each $v\in V$ do

7  Central node selection

8  If $\forall v^{\prime }\in N(v)\&\forall v^{\prime }\notin N(CN)$ and $ALL\left(v^{\prime }\right)\le ALL\left(v\right)$

9  Then

10   $CN=CN\cup \left\{v\right\}$

11   $ALL\left(v\right)=0$

12   Revise according to the CMI

13   For each $v_v\in N(v)$ do

14    $ALL\left(v_v\right)=GF\times {\displaystyle \sum _{u\in N(v_v)}IB(v_v,u)}$

15   End for

16 End for