1 Jenks G F, Coulson M R C. Class Intervals for Statistical Maps. Internationally Yearbook of Cartography, 1963. 119～134.
1 Jenks G F, Coulson M R C. Class Intervals for Statistical Maps. Internationally Yearbook of Cartography, 1963. 119～134.
陆效中.统计地图分级的一般原则与定量标准的探讨.军测科技,1987(1)∶10～17.