<sod>In [[glaciology]] and [[civil engineering]], '''Stefan's equation''' (or '''Stefan's formula''') describes the dependence of ice-cover thickness on the temperature history. It says in particular that the expected ice accretion is proportional to the square root of the number of [[degree days]] below freezing. It is named for Slovene physicist [[Joseph Stefan]].<eod>
<sod>In [[glaciology]] and [[civil engineering]], '''Stefan's equation''' (or '''Stefan's formula''') describes the dependence of ice-cover thickness on the temperature history. It says in particular that the expected ice accretion is proportional to the square root of the number of [[degree days]] below freezing. It is named for Austrian physicist [[Joseph Stefan|Josef Stefan]].<eod>