@article{Hoppe2009,
    author = "Hoppe, D. and Pfitzner, A.",
    title = "Adduct compounds (M Cl5)2 (beta-P4 Ch4) with M= Nb, Ta and Ch= S, Se",
    journal = "Zeitschrift fuer Naturforschung, B: Chemical Sciences",
    year = "2009",
    volume = "64",
    pages = "58-62",
    ASTM_id = "ZNBSEN"
}