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Blume-Capel model. It has been pointed out that the behavior of this system is very interesting and in partic- ular the strong-disorder regime may include many further challenges and open problems that, at the moment, are not fully understood. In our opinion, this is a rather complex subject deserving further research. 

The authors acknowledge useful e-mail correspondence with X.T. Wu. This research was supported by the Spe- cial Account for Research Grants of the University of Athens under Grant No. 70/4/4071. 

## Acknowledgments 

