Assign Multiple Variables

Say for example I have a health script. In inspector I should be able to assign a game object like an enemy so when the player collides within range of it the health decrease. However what if I have multiple enemies. How do I assign all of them in ‘target’ in the inspector.
#pragma strict

var range : int;
var target : GameObject;
var health : int=100;
var customGuiStyle : GUIStyle;

function Start () {
}

function Update () {
}

function OnCollisionEnter(info : Collision){

 range=Vector3.Distance(target.transform.position,transform.position);

 if (range<5){
  health-=4;
 }
 if (health<=0){
  yield WaitForSeconds(1);
  Destroy(gameObject);
 }
}

The direction of interaction between scripts is incorrect.

Health script should not bother about enemies, on the contrary, enemies should have script which will damage any Health script which will be touched.