@article{ljs24115,
 author={Butuza, A. and C. Balan, M.},
 year={2014},
 title={Thermal Aspects Related to the Operation of Photovoltaic Collectors with Water Film Cleaning System},
 journal={Leonardo J. Sci.},
 volume={13},
 number={24},
 pages={115-130},
 url={http://ljs.academicdirect.org/A24/115_130.pdf}
}