@article{AM2_1977__16_136684,
     author = {Steven B. Bank and Robert P. Kaufman},
     title = {On the {Weierstrass} functions, {Sigma,} {Zeta,} {Pe,} and their functional and differential equations.},
     journal = {Aequationes mathematicae},
     pages = {149--164},
     publisher = {mathdoc},
     volume = {16},
     year = {1977},
     zbl = {0378.33005},
     url = {http://geodesic.mathdoc.fr/item/AM2_1977__16_136684/}
}