[1] Al-Zoubi H., Stamatakis S., Al-Mashaleh W., Awadallah M.: 
Translation surfaces of coordinate finite type. Indian J. Math. 59 (2017), no. 2, 227–241. 
MR 3700538[2] Bekkar M., Senoussi B.: 
Translation surfaces in the $3$-dimensional space satisfying $\Delta ^{III}r_{i}=\mu _{i}r_{i}$. J. Geom. 103 (2012), no. 3, 367–374. 
DOI 10.1007/s00022-012-0136-0 | 
MR 3017050[3] Chen B.-Y.: 
Total Mean Curvature and Submanifolds of Finite Type. Series in Pure Mathematics, 1, World Scientific Publishing, Singapore, 1984. 
MR 0749575 | 
Zbl 0537.53049[4] Dillen F., Verstraelen L., Zafindratafa G.: A generalization of the translation surfaces of Scherk. Differential Geometry in honor of Radu Rosca. K. U. L. (1991), 107–109.
[10] Troyanov M.: 
L'horizon de $ SOL$. Exposition. Math. 16 (1998), no. 5, 441–479. 
MR 1656902[11] Yoon D. W.: 
Coordinate finite type invariant surfaces in $ Sol$ spaces. Bull. Iranian Math. Soc. 43 (2017), no. 3, 649–658. 
MR 3670886[12] Yoon D. W., Lee C. W., Karacan M. K.: 
Some translation surfaces in the $3$-dimensional Heisenberg group. Bull. Korean Math. Soc. 50 (2013), no. 4, 1329–1343. 
DOI 10.4134/BKMS.2013.50.4.1329 | 
MR 3092394