Original Research Published on 10 Jun 2013 Geographical gradients of dissolved Vitamin B12 in the Mediterranean Sea in Aquatic Microbiology Sophie BonnetAntonio Tovar-SanchezCaterina PanzecaEva Ortega-retuertaCarlos DuarteSergio Sanudo-Wilhelmy Frontiers in Microbiology doi 10.3389/fmicb.2013.00126 8,001 views 31 citations