Printed solenoid windings for miniature electromagnetic devicesKruusing, Arvi; Leppävuori, Seppo; Uusimäki, AnttiJournal of micromechanics and microengineering1999 / 2, p. 166-169: ill https://iopscience.iop.org/article/10.1088/0960-1317/9/2/315/pdf