Neb. Rev. Stat. §§ 48-129
In case any employee for whose injury or death compensation is payable under the Nebraska Workers' Compensation Act shall, at the time of the injury, be employed and paid jointly by two or more employers, as defined in section 48-114, such employers shall contribute to the payment of such compensation in proportion to their several wage liabilities to such employee. If one or more, but not all, of such employers should be subject to the Nebraska Workers' Compensation Act, then the liability of such of them as are so subject shall be to pay that proportion of the entire compensation which their proportionate wage liability bears to the entire wages of the employee, except that nothing in this section shall prevent employers from making any arrangement between themselves for a different distribution of the ultimate burden of compensation.
Neb. Rev. Stat. §§ 48-129