Santo V. E., Duarte A. R. C., Gomes M. E., Mano J. F., and Reis R. L.,  "Hybrid 3D structure of poly(D,L-lactic acid) loaded with chitosan/chondroitin sulfate nanoparticles with potentialapplication as carrier for biomacromolecules",  Journal of Supercritical Fluids, vol. 54, issue 3, pp. 320-327, 2012.