@article {20674,
	title = { The PbO2-PbO-B2O3 system in air},
	journal = {Thermochimica Acta},
	volume = {149},
	year = {1989},
	pages = {71-86},
	author = {Y.M. Kassem and A.N. Mahdy and M. F. Abadir}
}
