%0 Journal Article %T Extending a Single-Document Summarizer to Multi-Document: a Hierarchical Approach %A Lu¨ªs Marujo %A Ricardo Ribeiro %A David Martins de Matos %A Jo£¿o P. Neto %A Anatole Gershman %A Jaime Carbonell %J Computer Science %D 2015 %I arXiv %X The increasing amount of online content motivated the development of multi-document summarization methods. In this work, we explore straightforward approaches to extend single-document summarization methods to multi-document summarization. The proposed methods are based on the hierarchical combination of single-document summaries, and achieves state of the art results. %U http://arxiv.org/abs/1507.02907v1