1. Ask your boss for help. He/she shold know someone. With your boss's reference, it is much easier to get recommendation. Got one from that.
2. Check your paper's citation. If there are anyone who cite your paper, ask them for help. Your chance will be bigger since they cite your paper. Got one from that.
3. Ask your friend whether they can ask someone that they know of. Your friend's boss also might be willing to help. I askd my boss to write letter for one of my friend. Also got 2 from that way.
Hope it helps.
2. Check your paper's citation. If there are anyone who cite your paper, ask them for help. Your chance will be bigger since they cite your paper. Got one from that.
3. Ask your friend whether they can ask someone that they know of. Your friend's boss also might be willing to help. I askd my boss to write letter for one of my friend. Also got 2 from that way.
Hope it helps.