Note: this list is generated by looking for the string for this theme hook, so it may include some references that are not actually using this theme hook.

entityreference_field_formatter_info in core/modules/entityreference/entityreference.module
Implements hook_field_formatter_info().
entityreference_field_formatter_settings_form in core/modules/entityreference/entityreference.module
Implements hook_field_formatter_settings_form().
entityreference_field_formatter_settings_summary in core/modules/entityreference/entityreference.module
Implements hook_field_formatter_settings_summary().
entityreference_field_formatter_view in core/modules/entityreference/entityreference.module
Implements hook_field_formatter_view().
entityreference_field_info in core/modules/entityreference/entityreference.module
Implements hook_field_info().
entityreference_theme in core/modules/entityreference/entityreference.module
Implements hook_theme().