Equation Icon  ( ) ( ) -d- M ij1 + 2v[1iDj1] = ε2m2- 2n[1i2M j1]kvk1 − 4v[i1M j1]knk12 − 4n [i12M j1]kvk2 + 4v[2iM j1]knk12 dτ r12 26m2- k [i j]k + ε r3 n12n12I1 12 ( ) + ε22m2- nk ni Zk[jl]l− nk nj Zk [il]l+ nk ni Zj [kl]l− nk ni Zj [kl]l r312 12 12 1 12 12 1 12 12 1 12 12 1 + 𝒪 (ε3). (228 )