中国科学院数学与系统科学研究院期刊网
On the Multiplicity of Eigenvalues of a Vectorial Sturm-Liouville Problem with Discontinuous Conditions and Related Ambarzumyan's Theorem
LIU Xiaoyun, SHI Guoliang, YAN Jun
Acta Mathematicae Applicatae Sinica . 2020, (1): 33 -48 .  DOI: 10.12387/C2020003