Tuğ, Orhan. “Almost and Strongly Almost B(r ̃,s ̃,t ̃,u ̃)- Summable Double Sequences”. EURASIAN JOURNAL OF SCIENCE AND ENGINEERING, vol. 7, no. 2, Dec. 2021, pp. 71-89, https://doi.org/10.23918/eajse.v7i2p71.