In situ calibration of the Gamma Reaction History instrument using reference samples (“pucks”) for areal density measurements oleh Hoffman N.M., Herrmann H.W., Kim Y.H., Hsu H.H., Horsfield C.J., Rubery M.S., Wilson D.C., W. Stoeffl W., Young C.S., Mack J.M., Miller E.K., Grafil E., Evans S.C., Sedillo T.J., Glebov V.Yu., Duffy T.