I’m not aware of any studies that you can join at the moment, but the most up to date journal on anything speech related will be on ASHA wire (https://pubs.asha.org/). For specifically stuttering, A website that I love is Stuttering Therapy Resources (https://stutteringtherapyresources.com/) it’s run by a group of SLPs and researchers and they present research in a very digestible way.