@article{HoffschmidtPitzPaalBoehmer1999, author = {Hoffschmidt, Bernhard and Pitz-Paal, Robert and B{\"o}hmer, M.}, title = {A new closed/open volumetric receiver concept for parabolictrough collectors (test results)}, series = {Journal de physique. 9 (1999), H. 3}, journal = {Journal de physique. 9 (1999), H. 3}, isbn = {1155-4339}, pages = {3}, year = {1999}, language = {en} } @article{HoffschmidtPitzPaalBoehmer1997, author = {Hoffschmidt, Bernhard and Pitz-Paal, R. and B{\"o}hmer, M.}, title = {Experimental and numerical evaluation of the performance and flow stability of different types of open volumetric absorbers under non-homogeneous irradiation / R. Pitz-Pahl ; B. Hofschmidt ; M. B{\"o}hmer ...}, series = {Solar energy. 60 (1997), H. 3-4}, journal = {Solar energy. 60 (1997), H. 3-4}, isbn = {0038-092X}, pages = {135 -- 150}, year = {1997}, language = {en} }