1. B.L. Wersborg, J.B. Howard, G.C. Williams: “Physical Mechanism in Carbon Formation in Flames”, in Fourteenth Symposium (International) on Combustion ( The Combustion Institute, Pittsburgh 1972 ) p. 929
2. B.L. Wersborg, A.C. Yeung, J.B. Howard: “Concentration and Mass Distribution of Charged Species in Sooting Flames”, in Fifteenth Symposium (International) on Combustion ( The Combustion Institute, Pittsburgh 1974 ) p. 1439
3. P. Gerhardt, K.H. Homann, S. Löffler, H. Wolf: “Large ionic species in sooting acetylene and benzene flames”, in Proc. PEP Symp. Chania, Crete, Agard Conf. Proc. 422, 1987, pp. 22. 1–11
4. P. Gerhardt, S. Löffler, K.H. Homann: “The Formation of Polyhedral Carbon Ions in Fuel-Rich Acetylene and Benzene Flames”, in Twenty-Second Symposium (International) on Combustion ( The Combustion Institute, Pittsburgh 1988 ) p. 395
5. H. Bockhorn, F. Fetting, H.W. Wenz: Ber. Bunsenges. Phys. Chem. 87, 1067 (1983)