I'll translate the law for you, because English is probably not your strong point : Refugees with a residence permit can work without any work permit. They get a 3 year residence permit, just by entering the country and stating they want to remain there. There are no other papers involved.
English translation for max 80 IQ people : Refugee wants to enter Greece. Refugee gets stopped at the border, he is asked if he wants to remain in Greece, he says yes, he then gets a 3 year long residence permit by default, without basically doing anything else, because that's Greece's process of dealing with refugees. And why does this happen ? well because a refugee does not simply enter Greece like a guy jogging around park, goes to the closest supermarket to get a job saying "Hello i'm a refugee, i've just arrived 30 minutes ago, i want a job, nobody actually knows that i'm here, they let me through at the border because i look like a nice guy", and the supermarket employer says "yeah you look like a refugee, i guess we will just hire you, you don't even need a bank account, we will just pay you in cash".
Do you not understand the principle of - they are allowed to work without a work permit ? And the fact that they get the residence permit just by ARRIVING and ACCEPTING to stay in Greece ?
PS : a guy from Montenegro NEEDS 1. a residence permit, 2. a work permit. To follow the earlier example. You are literally clueless about your own country's visa and laws policy, and are probably just trolling around and wasting your life while trying to waste it for others also. I've tried my best to at least 'save' someone, but ... sometimes it's just impossible. I'm sorry for you if you don't understand this basic logic right now.