Spengler, D (Reprint Author), Univ Stuttgart, Inst Mineral & Kristallchem, Stuttgart, Germany.
Spengler, Dirk, Univ Stuttgart, Inst Mineral & Kristallchem, Stuttgart, Germany.
Spengler, Dirk; van Roermund, Herman L. M.; Drury, Martyn R., Univ Utrecht, Fac Geowetenschappen, Utrecht, Netherlands.