TY - JOUR T1 - Aspects of Predicative Algebraic Set Theory III: Sheaves UR - http://dx.doi.org/10.1112/plms/pdr066 PY - 2009/12/07 AU - Berg BVD AU - Moerdijk I ED - DO - DOI: 10.1112/plms/pdr066 Y2 - 2024/12/22 ER -