contract ERC20Token is Owned, ERC20TokenInterface {
    using SafeMath for uint256;
    uint256 public totalSupply;
    mapping(address => uint256) balances; //A mapping of all balances per address
    mapping(address => mapping(address => uint256)) allowed; //A mapping of all allowances

    /**
     * @dev Get the balance of an specified address.
     * @param _owner The address to be query.
     */
    function balanceOf(address _owner) public view returns(uint256 value) {
        return balances[_owner];
    }

    /**
     * @dev transfer token to a specified address
     * @param _to The address to transfer to.
     * @param _value The amount to be transferred.
     */
    function transfer(address _to, uint256 _value) public returns(bool success) {
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    /**
     * @dev transfer token from an address to another specified address using allowance
     * @param _from The address where token comes.
     * @param _to The address to transfer to.
     * @param _value The amount to be transferred.
     */
    function transferFrom(address _from, address _to, uint256 _value) public returns(bool success) {
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(_from, _to, _value);
        return true;
    }

    /**
     * @dev Assign allowance to an specified address to use the owner balance
     * @param _spender The address to be allowed to spend.
     * @param _value The amount to be allowed.
     */
    function approve(address _spender, uint256 _value) public returns(bool success) {
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
     * @dev Get the allowance of an specified address to use another address balance.
     * @param _owner The address of the owner of the tokens.
     * @param _spender The address of the allowed spender.
     */
    function allowance(address _owner, address _spender) public view returns(uint256 remaining) {
        return allowed[_owner][_spender];
    }

    /**
     * @dev Burn token of an specified address.
     * @param _value amount to burn.
     */
    function burnTokens(uint256 _value) public onlyOwner {
        balances[msg.sender] = balances[msg.sender].sub(_value);
        totalSupply = totalSupply.sub(_value);

        emit Transfer(msg.sender, address(0), _value);
        emit Burned(msg.sender, _value);
    }

    /**
     * @dev Log Events
     */
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
    event Burned(address indexed _target, uint256 _value);
}
/**
 * @title Token definition
 * @dev Define token parameters, including ERC20 ones
 */
function transfer(address _to, uint256 _value) public returns(bool success) {
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    emit Transfer(msg.sender, _to, _value);
    return true;
}

/**
 * @dev transfer token to a specified address
 * @param _to The address to transfer to.
 * @param _value The amount to be transferred.
 */