共 4 条
[1]
Gray L. H., 1936, P ROY SOC LOND A MAT, V156, P578, DOI 10.1098/rspa.1936.0169
[3]
LASNITZKY, 1940, BRIT J RAD, V13, P149
[4]
PARKER, 1935, BRIT RADIOL, V8, P684