Mid-Frequency Gravitational Wave Detection and Sources
  A brief history and various themes of mid-frequency gravitational wave
detection are presented more or less following historical order -- Laser
Interferometry, Atom Interferometry (AI), Torsion Bar Antenna (TOBA), and
Superconducting Omni-directional Gravitational Radiation Observatory (SOGRO).
Both Earth-based and Space-borne concepts are reviewed with outlook on expected
astrophysical sources
