@techreport{2007-Breemen-SheetsProcesses, author = "{Breemen}, A.J.J. van and {Sarbo}, J.J.", title = "{Sign Processes and the Sheets of Semeiosis}", number = "ICIS--R07003", month = "January", institution = "Radboud University Nijmegen", year = "2007", research_group = "iris", class = "Report" }