Hashmi, M. Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society;
Hashmi, M., Oordt, A. v. d. H. v. d., & Wegrowe, J. (1969). Experimental Investigations of Different Types of Losses in Contact Ionization Plasmas. In Physics of Quiescent Plasmas, Vol. 2 (pp. 127-138).