As I found it difficult and time consuming to find ressources on the issue I’m collecting links to what I found in the following.
NQHR – Access to justice in theEuropean Convention onHuman Rights system
ECHR Blog – by Antoine Buyse and Kushtrim Istrefi, Netherlands Institute of Human Rights
Strasbourg Observers – Stensholt v. Norway: Why single judge decisions undermine the Court’s legitimacy
Open Society Justice Initiative on ECHR Article 14
ECHR ECtHR Publications