000 00285nam a2200121Ia 4500
008 211209s1976 xx 000 0 und d
041 _aeng
082 _a516.352 N76 LYU
100 _aLYUSTERNIK L A
245 _aSHORTEST LINES VARIATIONAL PROBLEMS
260 _c1976
300 _a104
999 _c15235
_d15235