R. Wendlandt, “The system K2O-MgO-Al2O3-SiO2-H2O-CO2: phase relations of the joins Ph-H2O-CO2 and Ph-En-Mag at high temperatures and high pressures and applications to the genesis of alkalic magmas”, IKC abstracts, vol. 2, no. 1, pp. 355–357, Sep. 1977.