q=%28%E7%BE%8E%29%E6%9F%AF++%E6%9C%97%28courant%2Cr.%29%2C+%28%E7%BE%8E%29%E5%BC%97%E9%87%8C%E5%BE%B7%E9%87%8C%E5%85%8B%E6%96%AF%28friedrichs%2Ck.o.%29%E8%91%97&searchType=standard&isFacet=true&view=standard&searchWay=author&rows=10&sortWay=score&sortOrder=desc&searchWay0=marc&q0=&logical0=AND
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(美)柯 朗(courant,r.), (美)弗里德里克斯(friedrichs,k.o.)著