TY - JOUR T1 - Introduction JF - Practical Applications SP - 1 LP - 1 DO - 10.3905/pa.6.3.intro VL - 6 IS - 3 AU - Mark Adelson Y1 - 2019/01/31 UR - https://pm-research.com/content/6/3/1.20.abstract N2 - ER -