@misc{s2022a,
  title = {Characteristics of reciprocating speed of a low power consumption 4 K G-M cryocooler},
  author = {S Masuyama, K Kamiya, T Numazawa},
  publisher = {IOP Publishing},
  year = {2022-05-01},
  keywords = {4 K G-M cryocooler, reciprocating speed, low power cunsumption}
}