TY - JOUR AU - Chon, I. AU - Lawson, J. D. TI - Attainable sets and one-parameter semigroups of sets JO - Glasgow mathematical journal PY - 1991 SP - 187 EP - 201 VL - 33 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500008223/ DO - 10.1017/S0017089500008223 ID - 10_1017_S0017089500008223 ER -