Strong-Coupling $\phi^4$-Theory in $4- \epsilon$ Dimensions and Critical   Exponents
  With the help of variational perturbation theory we continue the renormalization constants $\phi^4$-theories in $4- \epsilon$ dimensions to strong bare couplings $g_0$ and find their power behavior in $g_0$, thereby determining all critical exponents without renormalization group techniques. 
Hagen Kleinert