1962, 18(11): 553-557.
DOI: 10.7498/aps.18.553
CSTR: 32037.14.aps.18.553
1962, 18(11): 558-562.
DOI: 10.7498/aps.18.558
CSTR: 32037.14.aps.18.558
1962, 18(11): 563-571.
DOI: 10.7498/aps.18.563
CSTR: 32037.14.aps.18.563


