Chemical nature of the nitrogens in polypyrrole and nitrogen-substituted polypyrrole: a comparative study by X-ray photoelectron spectroscopy - Tan, K. L.; Tan, B. T. G.; Kang, E. T.; Neoh, K. G. (Springer, 1992)
http://dx.doi.org/10.1007/BF01105104
Keywords: ZL