## English citations of *bifactor*

**2010**Jaroslaw Byrka at al, "LP-rounding algorithms for facility-location problems" arXiv- Besides obtaining the optimal
**bifactor**approximation as do Byrka and Aardal, we can now also show that the algorithm with scaling parameter equaling 1.58 is, in fact, an 1.58-approximation algorithm.

- Besides obtaining the optimal