TY - JOUR T1 - Introduction JF - Practical Applications SP - 1 LP - 1 DO - 10.3905/pa.6.2.intro VL - 6 IS - 2 AU - Mark Adelson Y1 - 2018/10/31 UR - https://pm-research.com/content/6/2/1.13.abstract N2 - ER -