Goo ISHIKAWA "Topologically extremal real algebraic surfaces in $\text{P}^{2}\times\text{P}^{1}$ and $\text{P}^{1}\times\text{P}^{1}\times\text{P}^{1}$," Hokkaido Mathematical Journal, Hokkaido Math. J. 21(1), 51-78, (February 1992)