Study of Two Handscrolls of "Going Up the River during the Qingming Festival" Attributed to Qiu Ying of the Ming in the Collection of the Museum of Ethnology in Leiden, the Netherlands 荷兰莱顿民族学博物馆收藏两幅明仇英《清明上河图》小考 - Gesterkamp, Lennert (World Art (世界美术), 2021)