Self-Determination in Catalonia

Further to our discussion of self-determination last week, you will be interested to read on recent developments in Catalonia. As the New York Times reported:

Catalan separatist parties won a majority of the seats in regional parliamentary elections on Sunday that they had billed as a plebiscite on secession from Spain.

The article continues here. Another article a couple of days after the election provides further analysis for what this means for Spain. In your view, do the Catalonians have a right of self-determination that would justify a declaration of independence and secession?