APA

Perkins G., Sahajwalla V. & Sahajwalla V.A mathematical model for the chemical reaction of a semi-infinite block of coal in underground coal gasification. : .

Chicago

Perkins Greg, Sahajwalla Veena and Sahajwalla Veena.A mathematical model for the chemical reaction of a semi-infinite block of coal in underground coal gasification. : .

Harvard

Perkins G., Sahajwalla V. and Sahajwalla V.A mathematical model for the chemical reaction of a semi-infinite block of coal in underground coal gasification. : .

MLA

Perkins Greg, Sahajwalla Veena and Sahajwalla Veena.: . .