Stéphane Grumbach Christophe Tollu Query Languages with Counters. 124-139 ICDT1992/P124.pdf 1992 ICDT db/conf/icdt/icdt92.html#GrumbachT92 conf/icdt/92 http://dx.doi.org/10.1007/3-540-56039-4_37 conf/stoc/AbiteboulV91 journals/iandc/BlassGK85 conf/focs/CaiFI89 journals/jcss/ChandraH80 journals/jcss/ChandraH82 conf/pods/DublishM89 ... ... ... ... ... journals/iandc/Grandjean83 conf/focs/GurevichS85 ... conf/focs/Gurevich83 ... journals/iandc/Immerman86 ... conf/stoc/KolaitisV87 conf/lics/KolaitisV88 conf/lics/KolaitisV90 journals/tcs/Lindell91 ... ... ... conf/stoc/Vardi82