@article{GruetersBlank1990,
  author    = {Gr{\"u}ters, Hugo and Blank, K.},
  title     = {Contribution to the size effect on the strength of flat glass. Blank, K.; Gr{\"u}ters, H.},
  series = {Glastechnische Berichte. 63 (1990), H. 5},
  journal   = {Glastechnische Berichte. 63 (1990), H. 5},
  isbn      = {0017-1085},
  pages     = {135 -- 140},
  year      = {1990},
  language  = {en}
}
@article{GruetersBlankDuerkopetal.1994,
  author    = {Gr{\"u}ters, Hugo and Blank, K. and D{\"u}rkop, D. and Durchholz, M.},
  title     = {Strength tests of flat glass by means of four-point bending. Blank, K.; D{\"u}rkop, D.; Durchholz, M.; Gr{\"u}ters, H.},
  series = {Glastechnische Berichte. Glass science and technology. 67 (1994), H. 1},
  journal   = {Glastechnische Berichte. Glass science and technology. 67 (1994), H. 1},
  isbn      = {0946-7475},
  pages     = {9 -- 15},
  year      = {1994},
  language  = {en}
}