@article{Greis1995,
    author = "Greis, O. and Ziel, R. and Breidenstein, B. and Haase, A. and Petzel, T.",
    title = "Structural data of the tysonite-type superstructure modification beta-Pr F3 from X-ray powder and electron single-crystal diffraction",
    journal = "Powder Diffraction",
    year = "1995",
    volume = "10",
    pages = "44-46",
    ASTM_id = "PODIE2"
}

@article{Diniz2005,
    author = "Diniz, E.M. and Paschoal, C.W.A.",
    title = "Structural phase transitions under pressure in rare earth trifluorides compounds with tysonite structure",
    journal = "Solid State Communications",
    year = "2005",
    volume = "136",
    pages = "538-542",
    ASTM_id = "SSCOA4"
}