Position Heaps for Permuted Pattern Matching on Multi-Track String. - Takashi Katsura; Yuhei Otomo; Kazuyuki Narisawa; Ayumi Shinohara (SOFSEM (Student Research Forum Papers / Posters), 2015)

Position Heaps for Parameterized Strings. - Diptarama; Takashi Katsura; Yuhei Otomo; Kazuyuki Narisawa; Ayumi Shinohara (CPM, 2017)