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- Nieves R. Brisaboa, Susana Ladra, Gonzalo Navarro
- Inf. Syst.
- 2014

The representation of large subsets of the World Wide Web in the form of a directed graph has been extensively used to analyze structure, behavior, and evolution of those so-called Web graphs.â€¦ (More)

- Nieves R. Brisaboa, Susana Ladra, Gonzalo Navarro
- SPIRE
- 2009

This paper presents a Web graph representation based on a compact tree structure that takes advantage of large empty areas of the adjacency matrix of the graph. Our results show that our method isâ€¦ (More)

- Nieves R. Brisaboa, Susana Ladra, Gonzalo Navarro
- SPIRE
- 2009

We introduce a symbol reordering technique that implicitly synchronizes variable-length codes, such that it is possible to directly access the i-th codeword without need of any sampling method. Theâ€¦ (More)

- Francisco Claude, Susana Ladra
- CIKM
- 2011

In this paper we focus on representing Web and social graphs. Our work is motivated by the need of mining information out of these graphs, thus our representations do not only aim at compressing theâ€¦ (More)

- Nieves R. Brisaboa, Susana Ladra, Gonzalo Navarro
- Inf. Process. Manage.
- 2013

We present a new variable-length encoding scheme for sequences of integers, Directly Addressable Codes (DACs), which enables direct access to any element of the encoded sequence without the need ofâ€¦ (More)

- Niko VÃ¤limÃ¤ki, Susana Ladra, Veli MÃ¤kinen
- CPM
- 2010

Finding approximate overlaps is the first phase of many sequence assembly methods. Given a set of r strings of total length n and an error-rate , the goal is to find, for all-pairs of strings, theirâ€¦ (More)

- Nieves R. Brisaboa, Antonio FariÃ±a, Susana Ladra, Gonzalo Navarro
- Information Retrieval
- 2012

Word-based byte-oriented compression has succeeded on large natural language text databases, by providing competitive compression ratios, fast random access, and direct sequential searching. We showâ€¦ (More)

- Susana Ladra, JosÃ© R. ParamÃ¡, Fernando Silva-Coira
- SSDBM
- 2016

Compact data structures combine in a unique data structure a compressed representation of the data and the structures to access such data. The target is to be able to manage data directly inâ€¦ (More)

- JosÃ© Manuel Casas, Manuel A. Insua, Manuel Ladra, Susana Ladra
- EUROCAST
- 2009

- Nieves R. Brisaboa, Antonio FariÃ±a, Susana Ladra, Gonzalo Navarro
- JISBD
- 2008

Recent research has demonstrated beyond doubts the benefits of compressing natural language texts using word-based statistical semistatic compression. Not only it achieves extremely competitiveâ€¦ (More)