中国科学院数学与系统科学研究院期刊网
AMS
A Covering Lemma on the Unit Sphere and Application to the Fourier-Laplace Convergence
Rong HUANG, Kun Yang WANG
Acta Mathematica Sinica . 2007, (7): 1327 -1332 .  DOI: 10.1007/s10114-005-0890-0