Phase-Locking in Strongly Coupled Squid Cells
  Within the RSJ model we performed an analytical and numerical investigation of SQUID cells consisting of two Josephson junctions shunted by an extremely small inductance leading to strong coupling of the elements. Contrary to the well-known behavior of cells shunted by a high inductance voltage phases of the junctions are locked with very small phase difference for almost all values of external flux. Only for external flux in the vicinity of half a flux quantum phase difference rises rapidly to $\pi$. 
M. Basler, W. Krech and K. Yu. Platov