lhs_ref            81 src/secOrd_op_brusselator.cpp   FE_function& lhs_ref = lhs;
lhs_ref            82 src/secOrd_op_brusselator.cpp   d_ptr -> bruss_cg(rhs_ref, lhs_ref);
lhs_ref            89 src/secOrd_op_brusselator.cpp   FE_function& lhs_ref = lhs;
lhs_ref            90 src/secOrd_op_brusselator.cpp   d_ptr -> bruss_op.mass_matrix(rhs_ref, lhs_ref);
lhs_ref           129 src/secOrd_op_brusselator.cpp   FE_function& lhs_ref = lhs;
lhs_ref           111 src/secOrd_op_linearHeat.cpp   FE_function& lhs_ref = lhs;
lhs_ref           112 src/secOrd_op_linearHeat.cpp   d_ptr -> heat_op.mass_matrix(rhs_ref, lhs_ref);