中国科学院数学与系统科学研究院期刊网
AMS
K-fusion Frames and the Corresponding Generators for Unitary Systems
Ai Fang LIU, Peng Tong LI
Acta Mathematica Sinica . 2018, (5): 843 -854 .  DOI: 10.1007/s10114-017-7196-x