000 00323nam a2200121Ia 4500
005 20250114225250.0
008 250113s9999 xx 000 0 und d
041 _aeng
082 _aPh7312:L40r
245 _aProperties of formal grammar
260 _c1969
_bUniv. of Pennsylvania Livg. Dept.
_aPhiladeliphia
365 _cRs.
999 _c136281
_d136281