1. Working team on ammonium bicarbonate (1974) Pilled ammonium bicarbonate, its fertility evaluation and producing technology. Soils (a bimonthly journal published in Chinese) No 3, p 91?96, Institute of Soil Science, Nanjing, China
2. Working team on ammonium bicarbonate (1974) Investigations on slow-release fertilizer from pilled ammonium bicarbonate. Soils, No 3, p 97?102, Institute of Soil Science, Nanjing, China
3. Working team on ammonium bicarbonate (1977) Pilled ammonium bicarbonate, a pamphlet published by the People's Press, Nanjing, China
4. Li CK (1976) A review of slow-release fertilizer. Agricultural Chemistry (a bimonthly journal published in Chinese), No 2, p 1?18, Institute of Soil Science, Nanjing, China
5. Chen RY and Fan QZ (1978) The status of nitrogen supply of deep drilled ammonium bicarbonate pills in non-calcareous paddy soils. Acta Pedol Sin 15, 75?82