@article{Bakker_2005,
title={Performance and costs of a roof-sized PV/thermal array combined with a ground coupled heat pump},
volume={78},
ISSN={0038-092X},
url={http://dx.doi.org/10.1016/j.solener.2004.09.019},
DOI={10.1016/j.solener.2004.09.019},
number={2},
journal={Solar Energy},
publisher={Elsevier BV},
author={Bakker,
M. and Zondag,
H.A. and Elswijk,
M.J. and Strootman,
K.J. and Jong,
M.J.M.},
year={2005},
month=feb,
pages={331–339} }