Przemyslaw Nowakowski Jerzy Charytonowicz Ergonomic Design of Children's Play Spaces in the Urban Environment. 517-526 2007 conf/hci/2007-6 HCI (6) http://dx.doi.org/10.1007/978-3-540-73281-5_55 db/conf/hci/hci2007-6.html#NowakowskiC07