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@ARTICLE{ossenkopf08a,  author = {{Ossenkopf}, V. and {Krips}, M. and {Stutzki}, J.},  title = "{Structure analysis of interstellar clouds. I. Improving the {$\Delta$}-variance method}",  journal = {\aap},  archivePrefix = "arXiv",  eprint = {0804.4649},  keywords = {methods: data analysis, methods: statistical, ISM: clouds, ISM: structure},  year = 2008,  month = jul,  volume = 485,  pages = {917-929},  doi = {10.1051/0004-6361:20079106},  adsurl = {http://adsabs.harvard.edu/abs/2008A%26A...485..917O},  adsnote = {Provided by the SAO/NASA Astrophysics Data System}  }  @ARTICLE{ossenkopf08b,  author = {{Ossenkopf}, V. and {Krips}, M. and {Stutzki}, J.},  title = "{Structure analysis of interstellar clouds. II. Applying the {$\Delta$}-variance method to interstellar turbulence}",  journal = {\aap},  archivePrefix = "arXiv",  eprint = {0804.4877},  keywords = {methods: data analysis, methods: statistical, ISM: clouds, ISM: structure},  year = 2008,  month = jul,  volume = 485,  pages = {719-727},  doi = {10.1051/0004-6361:20079107},  adsurl = {http://adsabs.harvard.edu/abs/2008A%26A...485..719O},  adsnote = {Provided by the SAO/NASA Astrophysics Data System}  }  @ARTICLE{stutzki98,  author = {{Stutzki}, J. and {Bensch}, F. and {Heithausen}, A. and {Ossenkopf}, V. and   {Zielinsky}, M.},