We extend singular integral operators T on L
p-spaces to operators on L
p, φk-spaces. The space L
p, φk is defined by using the mean oscillation and it is the space of classes of functions modulo \wp
k, polynomials of degree less than or equal to k. We define Tf for f \in L
p, φk as an element of L
ploc/\wp
k with constructive method, and estimate the norm of Tf.
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