TY  - JOUR 
T1  - Effects of pentoxifylline treatment before freezing on motility, viability and acrosome status of poor quality human spermatozoa cryopreserved by the liquid nitrogen vapor method
JO  - Brazilian Journal of Medical and Biological Research
A1  - Esteves, S.C.
A1  - Spaine, D.M.
A1  - Cedenho, A.P.
SN  - 0100-879X
UL  - 10.1590/S0100-879X2006005000118
VL  - 40 
Y1  - 2007
PB  - Brasil 
ER  -