On Converse Theorem of Best Approximation by Polynomials in Bergman Spaces Hqp(p>0,q>1)
邢富冲
On Converse Theorem of Best Approximation by Polynomials in Bergman Spaces Hqp(p>0,q>1)
数学季刊 . 1993, (4): 89 -98 .