Perceived exertion and exercise intensity in children with or without structural heart defectsBrenda Eakin, Robert H. Beekman, Kathleen M. Finta et al.|The Journal of Pediatrics|1992Cited by 19
Hemodynamic responses to upright exercise of adolescent cardiac transplant recipientsSteve Christos, Robert H. Beekman, Amy Lindauer et al.|The Journal of Pediatrics|1992Cited by 19