Zirconium - containing glasses with increased chemical and thermal stability /
Botvinkin, O. K.
Demichev, S. A.
Naidenov, A. P.
Gray, D. R.
Garston :  Building Research Station, 
1969.
Originally published as Tsirkoniisoderzhashchie stekla s povyshennoi khimicheskoi i termicheskoi ustoichivostyu, in Steklo, 1967, (2), 20-3*.