TY - CONF T1 - Modal semirings revisited JO - MATHEMATICS OF PROGRAM CONSTRUCTION, PROCEEDINGS PY - 2008/01/01 AU - Desharnais J AU - Struth G ED - Audebaud P ED - PaulinMohring C VL - 5133 SP - 360 EP - 387 Y2 - 2024/12/22 ER -