Authors: Blass, A Frankiewicz, R Plebanek, G Ryll-Nardzewski, C

Citation: A. Blass et al., Note on extensions of asymptotic density, P AM MATH S, 129(11), 2001, pp. 3313-3320

Authors: Frankiewicz, R Plebanek, G Ryll-Nardzewski, C

Citation: R. Frankiewicz et al., Between the Lindelof property and countable tightness, P AM MATH S, 129(1), 2000, pp. 97-103