References
- Bressan , A . 1990 . Hyper-impulsive motions and controllizable coordinates for Lagrangian systems . Atti Accad Naz Lincei Mem CI Sc Fis Mat Natur , 19 : 197 – 246 . Series VIII
- Bressan , A . 2007 . Singular limits for impulsive lagrangian systems with dissipative sources . Prog Nonlinear Differ Equ Appl , 75 : 79 – 103 .
- Case , WB . 1980 . Parametric instability: an elementary demonstration and discussion . Am J Phys , 48 ( 3 ) : 218 – 221 .
- Case , WB . 1996 . The pumping of a swing from the standing position . Am J Phys , 64 : 215 – 220 .
- Case , WB and Swanson , MA . 1990 . The pumping of a swing from the seated position . Am J Phys , 58 : 463 – 467 .
- Curry , SM . 1976 . How children swing . Am J Phys , 44 : 924 – 926 .
- Lima , FMS . 2008 . Simple ‘log formulae’ for pendulum motion valid for any amplitude . Eur J Phys , 29 : 1091 – 1098 .
- McMullan , JT . 1972 . On initiating motion in a swing . Am J Phys , 40 : 764 – 766 .
- Piccoli , B and Kulkarni , J . 2005 . Pumping a swing by standing and squatting . IEEE Control Syst Mag , 25 ( 4 ) : 48 – 56 .
- Post , AA , de Groot , G , Daffertshofer , A and Beek , PJ . 2007 . Pumping a playground swing . Motor Control , 11 ( 2 ) : 136 – 150 .
- Wirkus , S , Rand , R and Ruina , A . 1998 . How to pump a swing . Coll Math J , 29 ( 4 ) : 266 – 275 .