Evidence of the use of white phosphorus by Israel in its war on Gaza is everywhere. Videos, photographs and accounts by bloggers and reporters are more than sufficient.
Medical evidence on the effects and management of white phosphorus is scarce. Pubmed returns 14 papers with search criteria "`white phosphorus' burn" most of them describing the experiences of burn units along its years of operation with people who contacted the material accidentally.
White phosphorus is an extremely menacing substance whether it is used on a densely populated area or not.
It ignites spontaneously at temperatures above 34°C, producing fumes with a garlic-like odour and phosphoric acid which promotes further burning. It can be extinguished with water but will reignite again when dry.
So if a person comes in contact with phosphorus. He will suffer burns that might start again spontaneously inside his own wound. Even hours later.
A solemn account of the properties of white phosphorous burns is mentioned in the `In Gaza' blog: