× 2011 AND oaclassfiainone:"几何与拓扑" AND oaauthorstr:"曹怀东"

× %20AND%20oaclassfiainone:%22%E5%87%A0%E4%BD%95%E4%B8%8E%E6%8B%93%E6%89%91%22%20AND%20oaauthorstr:%22%E6%9B%B9%E6%80%80%E4%B8%9C%22

× 2011%20AND%20oaclassfiainone:%22%E5%87%A0%E4%BD%95%E4%B8%8E%E6%8B%93%E6%89%91%22%20AND%20oaauthorstr:%22%E6%9B%B9%E6%80%80%E4%B8%9C%22