共 19 条
[2]
BRINKMANN M, 1924, ANN MATH, V91, P269
[3]
SYMMETRIES OF TYPE N EMPTY SPACE-TIMES POSSESSING TWISTING GEODESIC RAYS
[J].
JOURNAL OF PHYSICS PART A GENERAL,
1969, 2 (06)
:621-+
[8]
EHLERS J, 1962, GRAVITATION INTRO CU, P80
[9]
HALFORD WD, 1977, THESIS
[10]
HALFORD WD, UNPUBLISHED