code: @Override
      public List<Citation> getCitations(KamInfo kamInfo,
              BelDocumentInfo belDocumentInfo) {
          if (null == kamInfo) {
              throw new InvalidArgument("kamInfo", kamInfo);
          }
          if (!exists(kamInfo)) return null;
  
          try {
              return kamStoreDao(kamInfo).getCitations(belDocumentInfo);
          } catch (SQLException e) {
              final String fmt = "error getting KAM nodes for %s";
              final String msg = format(fmt, kamInfo.getName());
              throw new KAMStoreException(msg, e);
          }
      }
docs: {@inheritDoc}