Bogdan S. Chlebus On the Klee's Measure Problem in Small Dimensions. 304-311 https://doi.org/10.1007/3-540-49477-4_22 https://www.wikidata.org/entity/Q29391219 1998 conf/sofsem/1998 SOFSEM db/conf/sofsem/sofsem1998.html#Chlebus98