@electronic{stackoverflow.com,
   title       = {piglatin - Pig Batch mode: how to set logging level to hide INFO log messages? - Stack Overflow}, 
   url         = {http://stackoverflow.com/questions/16627748/pig-batch-mode-how-to-set-logging-level-to-hide-info-log-messages},
   biburl      = {https://puma.uni-kassel.de/url/86fc925931ec439eaa13f41a8fa32b71/stephandoerfel},
   keywords    = {log4j logging pig},
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@electronic{pig.apache.org,
   title       = {Pig Latin Basics}, 
   url         = {http://pig.apache.org/docs/r0.12.0/basic.html#group},
   biburl      = {https://puma.uni-kassel.de/url/a5670cbeffd3e7a23260426df000dc23/stephandoerfel},
   keywords    = {basics pig tutorial},
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@electronic{pig.apache.org,
   title       = {Welcome to Apache Pig!}, 
   url         = {http://pig.apache.org/},
   biburl      = {https://puma.uni-kassel.de/url/a16819a4998a5d215dd1b28d7ebd6f18/benz},
   keywords    = {analysis apache data large_scale pig},
   added-at    = {2011-03-15T23:23:09.000+0100},
   description = {Apache Pig is a platform for analyzing large data sets that consists of a high-level language for expressing data analysis programs, coupled with infrastructure for evaluating these programs. The salient property of Pig programs is that their structure is amenable to substantial parallelization, which in turns enables them to handle very large data sets.},
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@electronic{pig.apache.org,
   title       = {Welcome to Apache Pig!}, 
   url         = {http://pig.apache.org/},
   biburl      = {https://puma.uni-kassel.de/url/a16819a4998a5d215dd1b28d7ebd6f18/hotho},
   keywords    = {analysis dataset datastore large pig},
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