1. Bibliography on construction, design, economics, performance and theory of portable and small stationary gas producers, AIC-103;Novakovaska,1945
2. Producer gas — its potential and application in developing countries;Breag,1979
3. Wood gasification — an old technology with a future;Overmend,1977
4. Producer gas, 1980 — local electricity generation from wood and agricultural residues;Kjellstrom,1981