Liu, C.-L.C.-L.LiuVaidyanathan, P.P.P.P.Vaidyanathan2019-04-232019-04-232017https://www.scopus.com/inward/record.uri?eid=2-s2.0-84971656929&doi=10.1016%2fj.dsp.2016.04.011&partnerID=40&md5=28e6769819b878b8760a8ae51eea31e1https://scholars.lib.ntu.edu.tw/handle/123456789/405759Cram?r¡VRao bounds for coprime and other sparse arrays, which find more sources than sensorsjournal article10.1016/j.dsp.2016.04.0112-s2.0-84971656929