1. Note on the derivatives with respect to a parameter of the solutions of a system of differential equations;Gronwall;Ann. Math.,1919
2. Inequalities;Beckenbach,1961
3. A two independent variable Gronwall type inequality;Snow,1971
4. Gronwall's inequality for systems of partial differential equations in two independent variables;Snow;Proc. Am. math. Soc.,1972
5. Gronwall's inequality in n independent variables;Young;Proc. Am. math. Soc.,1973