Haruhiko Kaiya Masaaki Tanigawa Shunichi Suzuki Tomonori Sato Kenji Kaijiri Spectrum Analysis for Quality Requirements by Using a Term-Characteristics Map. 546-560 2009 CAiSE http://dx.doi.org/10.1007/978-3-642-02144-2_42 conf/caise/2009 db/conf/caise/caise2009.html#KaiyaTSSK09