Sudden death and other risks associated with dry-sand beach holes.

[1]  F O Mueller,et al.  Sudden death in young competitive athletes. Clinical, demographic, and pathological profiles. , 1996, JAMA.

[2]  F O Mueller,et al.  Blunt impact to the chest leading to sudden death from cardiac arrest during sports activities. , 1995, The New England journal of medicine.

[3]  S. Baker,et al.  Deaths from trench cave-in in the construction industry. , 1988, Journal of occupational medicine. : official publication of the Industrial Medical Association.