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Bepler, G., Koehler, A., Kiefer, P., Havemann, K., Beisenherz, K., Jaques, G., … Haeder, M. (1988). Characterization of the state of differentiation of six newly established human non-small-cell lung cancer cell lines. Differentiation, 37(2), 158–171. doi:10.1111/j.1432-0436.1988.tb00806.x 
10.1111/j.1432-0436.1988.tb00806.x