Shepherd T.A. Spillage of flue gases from solid-fuel combustion appliances / T. A. Shepherd, 1994. - 4 p. - Текст : непосредственный.
Shepherd T.A. Spillage of flue gases from open-flued combustion appliances / T.A.Shepherd, 1992. - 4 p. - Текст : непосредственный.