Pugmire, R. J., Orendt, A. M., Facelli, J. C., & Grant, D. M. (1991). COMPARISON OF 13C CHEMICAL SHIELDING ANISOTROPY IN MODEL COMPOUNDS & COALS WITH THEORETICAL VALUES. In 1991 International Conference on Coal Science Proceedings (pp. 72–75). Elsevier. https://doi.org/10.1016/b978-0-7506-0387-4.50021-8

Pugmire, R. J., A. M. Orendt, J. C. Facelli, and D. M. Grant. “COMPARISON OF 13C CHEMICAL SHIELDING ANISOTROPY IN MODEL COMPOUNDS & COALS WITH THEORETICAL VALUES.” In 1991 International Conference on Coal Science Proceedings, 72–75. Elsevier, 1991. https://doi.org/10.1016/b978-0-7506-0387-4.50021-8.

Pugmire RJ, Orendt AM, Facelli JC, Grant DM. COMPARISON OF 13C CHEMICAL SHIELDING ANISOTROPY IN MODEL COMPOUNDS & COALS WITH THEORETICAL VALUES. In: 1991 International Conference on Coal Science Proceedings. Elsevier; 1991. p. 72–5.

Pugmire, R. J., et al. “COMPARISON OF 13C CHEMICAL SHIELDING ANISOTROPY IN MODEL COMPOUNDS & COALS WITH THEORETICAL VALUES.” 1991 International Conference on Coal Science Proceedings, Elsevier, 1991, pp. 72–75. Crossref, doi:10.1016/b978-0-7506-0387-4.50021-8.

Pugmire RJ, Orendt AM, Facelli JC, Grant DM. COMPARISON OF 13C CHEMICAL SHIELDING ANISOTROPY IN MODEL COMPOUNDS & COALS WITH THEORETICAL VALUES. 1991 International Conference on Coal Science Proceedings. Elsevier; 1991. p. 72–75.