4th order similarity renormalization of a model hamiltonian
4U 0115+63.
4U 0115+63: A bonanza of cyclotron resonance scattering features
4U 0115+63: phase lags and cyclotron resonant scattering
4U 1636-536 and 4U 0614+091
4U 1705-44: Jet emission from a neutron star binary
4U 1812-12.
4U0115+63 Hard X-ray Images and Spectra from the InFOCuS Experiment
4U:0115+63
4U:2129+47 / V1727-CYGNI - a Low-Mass X-Ray Binary in an Extended Quiescent State
4vesta
4ω Thomson scattering probe for high-density plasma characterization at Titan