https://voennoedelo.com/posts/id76538-prodvizhenie-u-kotlino-boi-v-pervom-mae-armija-rossii-usilivaet-davleni…
https://voennoedelo.com/posts/id76538-prodvizhenie-u-kotlino-boi-v-pervom-mae-armija-rossii-usilivaet-davlenie-na-pokrovskom-napravlenii
Автор: Юрий Лебедев