1Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences H-1525 Budapest, P.O. Box 102, Hungary 2Szabolcs-Sz.-B. County Goverment Office of Plant and Soil Conservation Board H-4400 Nyíregyháza, Kótaji út 33, Hungary 3Department of Zoology, Hungarian Natural History Museum H-1083 Budapest, Baross u. 13, Hungary *Corresponding author’s e-mail: tobias.istvan@agr...

In this report we characterize all context-free grammars with not more than three nonterminals generating only primitive words. 1This work was supported by the German-Hungarian Research Project 102 of OMFB ( Hungarian Research Foundation ) and Project X 233.6 of Forschungszentrum Karlsruhe

2. Jakab M, Major J, Tompa A. (1995): Négyvégpontos genotoxikológiai monitorozás történeti ésipari kontroll populációban. Magyar Onkológia, 39:Suppl. 81. Abstract. (In Hungarian) 3. Major J, Jakab M, Tompa A. (1995): Daganat-rizikóbecslés citosztatikummal exponáltegészségügyi dolgozókban. Magyar Onkológia, 39:Suppl. 84. Abstract. (In Hungarian) 4. Jakab M, Major J, Tompa A. (1995): Geno...

A. Gyartas HUNGARIAN ACADEMY OF SCIENCES