https://www.humanreligions.info/tags/concerned_christians.html
Human Truth Foundation pages (4):
A List of Christian Denominations and Sects: 3.25. Concerned Christians (1980s)
The End of the World is Nigh! The Dangers of Apocalyptism and End-Times Beliefs: 7.1. Concerned Christians, Pilgrim House Community, House of Prayer and Solomon's Temple (all in Israel)
Human Religions
Christianity: 4. Denominations