Arthashastra
दीर्घ प्रवासिनः प्रव्रजितस्य प्रेतस्य वा भार्या सप्त तीर्थान्य् आकाङ्क्षेत, संवत्सरं प्रजाता ॥
In the case of husbands who have long gone abroad (dirgrhapravásinah), who have become ascetics, or who have been dead, their wives, having no issue, shall wait for them for the period of seven menses; but if they have given birth to children, they shall wait for a year.
english translation
dIrgha pravAsinaH pravrajitasya pretasya vA bhAryA sapta tIrthAny AkAGkSeta, saMvatsaraM prajAtA ॥
hk transliteration by Sanscript