target_sources(
  ActsCore
  PRIVATE
    KalmanFitterError.cpp
    GainMatrixUpdater.cpp
    GainMatrixSmoother.cpp
    GlobalChiSquareFitterError.cpp
    GsfError.cpp
    GsfUtils.cpp
    BetheHeitlerApprox.cpp
    GsfMixtureReduction.cpp
    GlobalChiSquareFitter.cpp
)
