TY  - JOUR 
T1  - The Hierarchy of Hamiltonians for a Restricted Class of Natanzon Potentials
JO  - Brazilian Journal of Physics
A1  - Drigo Filho, Elso
A1  - Ricotta, Regina Maria
SN  - 0103-9733
UL  - 10.1590/S0103-97332001000200029
VL  - 31 
Y1  - 2001
PB  - Brasil 
ER  -