"Kitsur Shulchan Aruch" by Shlomo Ganzfried

The compiler of this Kitsura Kitsura Luba Ahuva Petrushanskaya

1.gl.145, par.15. If 2 women died husband, she should not get married for the third time, without consulting with a rabbi.

2.gl.145, par.18. If a person is suspected in connection with the Gentile woman, and she took iudaizm- he should not marry her.