共 6 条
[2]
Eells J., 1978, B LOND MATH SOC, V10, P1, DOI [10.1112/blms/10.1.1, DOI 10.1112/BLMS/10.1.1]
[3]
HERSCH J, 1970, CR ACAD SCI A MATH, V270, P1645
[6]
Yang P., 1980, ANN SCUOLA NORM-SCI, V7, P55