Cambio, D.D.CambioYU-NING GE2019-12-242019-12-242007https://scholars.lib.ntu.edu.tw/handle/123456789/438436Effects of parallel gradation on strength properties of ballast materialsconference paper10.1061/40917(236)142-s2.0-34548603059https://www.scopus.com/inward/record.uri?eid=2-s2.0-34548603059&doi=10.1061%2f40917%28236%2914&partnerID=40&md5=223dad15e8a8b6cc7617acdbf27bb299