A non-exhaustive list of relevant topics include:

Models & measures for multiplex networks

           

        Centrality in mutiplex networks

        Paths, clustering coefficient in multiplex networks

        Random walks on mutltiplex networks

        Co-evolution of layers in multiplex networks.

        Layer aggregation approaches.

        Vertex similarity in multiplex network

      

Community detection in multiplex network

        Multiplex network partitionning

        Multi-layer modularity functions

        Overlapping community detection

Dynamic & multiplex networks

        Link prediction in multiplex network

        Missing links detection

        Multiplex network evolution models

        Dynamic networks as a multiplex

       

Machine learning approaches

   

        Ensemble learning for multiplex network mining

        Multi-view clustering

        Collaboratif learning

        ...

Applications

        Recommender systems

        Heteregeneous network mining

        Reality mining

        Mobility data mining

        Networks of networks analysis

        ...