On the second eigenfunctions of the Laplacian in R2

CHANG-SHOU LIN2018-09-102018-09-101987http://www.scopus.com/inward/record.url?eid=2-s2.0-34250107637&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/329473On the second eigenfunctions of the Laplacian in R2journal article10.1007/BF012177582-s2.0-34250107637