共 6 条
[1]
Collatz L., 1942, Math. Z, V48, P221, DOI DOI 10.1007/BF01180013
[5]
Ostrowski A., 1952, J. London Math. Soc, V27, P253
[6]
SCHNEIDER H, 1958, P EDINBURGH MATH SOC, V11, P127