Question: Maple 8 solves. Maple 9 and Maple 11 do not solve.

Hello,
I need to solve this integral:

assume(1 > q, q > 0, 1 > p, p >0, q > p);
lambda21 := int(int(int(((xs-xr)^2+(ys-p)^2)*xr/(xs-xr),xr=0..(2-p)*xs/(2-ys)),xs=0..q),ys=0..p);

The result in Maple 8 is:

lambda21 := -1/96*q^2*(256*ln(2)-256*ln(2-p)-48*p^3*ln(2)+16*p^3*ln(p)-384*p*ln(2)+384*p*ln(2-p)+32*p^3*ln(2-p)+192*p^2*ln(2)-192*p^2*ln(2-p)+q^2*p^3-4*q^2*p-128*p-48*lambda21^3+160*p^2);

The result in Maple 9.5 is:

lambda21 := int(int(int((xs^2-2*xs*xr+xr^2+ys^2-2*ys*p+p^2)*xr/(xs-xr), xr = 0 .. (-2+p)*xs/(-2+ys)), xs = 0 .. q), ys = 0 .. p)

Maple 8 solves my integral. Instead Maple 9.5 writes my integral but it doesn't solve it.
Why?

I tried to solve it also with Maple 11 but there is the same problem.

Thanks
Best Regards.

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