There will be another edition of the International Workshop on Visualization and Interaction for Ontologies and Linked Data (VOILA) at the 16th International Semantic Web Conference (ISWC) in October 2017. The deadline for submissions is July 21, 2017. More details are available at the VOILA 2017 workshop website.
A comprehensive article on VOWL appeared in the journal Semantic Web – Interoperability, Usability, Applicability:
References to other VOWL-related papers can be found in the VOWL Specification, the QueryVOWL Language Reference and on the web pages of the individual approaches and tools WebVOWL, ProtégéVOWL, LD-VOWL, QueryVOWL, VoCol, and OntoBench.