The most thorough short paper in English is likely (found in Islamic Creeds: A Selection , Edinburgh University Press, though originally a paper in JRAS or similar).

Would you like a summary of its key theological points (e.g., on divine attributes, faith, or predestination) as found in these papers?

A useful and widely referenced paper covering Aqaid al-Nasafi (often spelled Aqā'id al-Nasafī ) is: