### Editorial. A case of plagiarism: retraction of a paper by Sreenivas and Srinivas, Vol. 43, n°4, pp. 331–337

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We present briefly some results we obtained with known methods to solve minimum cost tension problems, comparing their performance on non-specific graphs and on series-parallel graphs. These graphs are shown to be of interest to approximate many tension problems, like synchronization in hypermedia documents. We propose a new aggregation method to solve the minimum convex piecewise linear cost tension problem on series-parallel graphs in $O\left({m}^{3}\right)$ operations.

We present briefly some results we obtained with known methods to solve minimum cost tension problems, comparing their performance on non-specific graphs and on series-parallel graphs. These graphs are shown to be of interest to approximate many tension problems, like synchronization in hypermedia documents. We propose a new method to solve the minimum convex piecewise linear cost tension problem on series-parallel graphs in operations.

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