As of 2009 the Montenegrin alphabet was adopted in Montenegro. It consists of the same alphabet as used in Serbia, with the addition of two graphemes.
The graphemes ⟨ś⟩/⟨с́⟩ and ⟨ź⟩/⟨з́⟩ are said to represent sounds unique amongst the Shtokavian languages, where they are palatalised variations of /s/ and /z/. I've seen this phoneme written as /ɕ/, /sʲ/ and /ç/ for ⟨ś⟩ and /ʝ/ for ⟨ź⟩.
So my question is this, which of these phonemes is correct.