GRGM900C: A degree 900 lunar gravity model from GRAIL primary and extended mission data by Frank G. Lemoine and others (2014, 10.1002/2014GL060027)

Geophysical Research Letters 41, 3382–3389. Sections 4.2–4.3 explain the topographic gravity prediction and the residual Bouguer gravity anomaly field. This is the gravity-model publication credited by the 2022 examination.