[Avodah] Zimun - 2 women with 1 man - permitted?

[Shoshana L. Boublil]

Yonathan Gershon from Har Etzion Yeshiva wrote an article that proves that
within a family, it is definitely permitted.

A Rosh Yeshiva, Rabbi Gigi, approved the article and its proofs. Rabbi
Meidan doesn't agree with everything, but writes that his conclusions are
halachically correct.

http://www.bmj.org.il/akdama/34/m -  a   link to the synopsis.

An article about this, with some comments, appears in
http://www.ynet.co.il/articles/0,7340,L-4048259,00.html

If someone has access to Akdamot, perhaps they can add some sources.

Shoshana L. Boublil