The paper deals with the singular Sturm - Liouville expressions <$El(y)~=~-(py prime ) prime ~+~qy> with the matrix-valued coefficients p, q such that <$Eq~=~Q prime ,~p sup -1 ,~ p sup -1 Q>, <$EQp sup -1 , ~Qp sup -1 Q~symbol <174>~L sub 1>, where the derivative of the function Q is understood in the sense of distributions. Due to a suitable regularization, the corresponding operators are correctly defined as quasi-differentials. Their resolvent convergence is investigated and all self-adjoint, maximal dissipative, and maximal accumulative extensions are described in terms of homogeneous boundary conditions of the canonical form.

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