A LOWER BOUND FOR DELTA-NIELSEN NUMBER

[1] BARNIER L, 1967, THESIS U CALIFORNIA

[2] BOJU J, 1964, CHINESE MATHEMATICS, V5, P330

[3] Brooks R., 1967, THESIS U CALIFORNIA

[4] A CERTAIN SUBGROUP OF FUNDAMENTAL GROUP [J]. AMERICAN JOURNAL OF MATHEMATICS, 1965, 87 (04) : 840 - &

[5] Hu S. T., 1964, ELEMENTS GENERAL TOP

[6] HU ST, 1950, OSAKA MATH, V2, P165

[7] ELEMENTS IN S-GROUPS WITH TRIVIAL CENTRALIZERS [J]. COMMUNICATIONS ON PURE AND APPLIED MATHEMATICS, 1960, 13 (04) : 679 - 683

[8] Examination of the topology of closed two sided areas [J]. ACTA MATHEMATICA, 1927, 50 (01) : 189 - 358

[1] BARNIER L, 1967, THESIS U CALIFORNIA

[2] BOJU J, 1964, CHINESE MATHEMATICS, V5, P330

[3] Brooks R., 1967, THESIS U CALIFORNIA

[4] A CERTAIN SUBGROUP OF FUNDAMENTAL GROUP [J]. AMERICAN JOURNAL OF MATHEMATICS, 1965, 87 (04) : 840 - &

[5] Hu S. T., 1964, ELEMENTS GENERAL TOP

[6] HU ST, 1950, OSAKA MATH, V2, P165

[7] ELEMENTS IN S-GROUPS WITH TRIVIAL CENTRALIZERS [J]. COMMUNICATIONS ON PURE AND APPLIED MATHEMATICS, 1960, 13 (04) : 679 - 683

[8] Examination of the topology of closed two sided areas [J]. ACTA MATHEMATICA, 1927, 50 (01) : 189 - 358