On a new variational principle in general relativity and the energy of the gravitational field Jerzy Kijowski Research Articles Pages: 857 - 877
Equivalence of vacuum Yang-Mills gravitation and vacuum Einstein gravitation George DebneyEdward E. Fairchild Jr.Stephen T. C. Siklos Research Articles Pages: 879 - 887
Vortical null orbits, repulsive barriers, energy confinement in Kerr metric M. CalvaniF. de Felice Research Articles Pages: 889 - 902
A solution of the Maxwell equations for any static, axisymmetric vacuum space-time Edgar Pechlaner Research Articles Pages: 903 - 909