Quantum homogeneous spaces, duality, and quantum 2-spheres / M.S. Dijkhuizen, T.H. KoornwinderOn compact quantum groups and quantum homogeneous spaces / Mathijs Sebastiaan DijkhuizenCQG algebras: a direct algebraic approach to compact quantum groups / M.S. Dijkhuizen, T.H. KoornwinderSome limit transitions between BC type orthogonal polynomials interpreted on quantum complex grassmannians / by Mathijs S. Dijkhuizen and Jasper V. Stokman