One-Handed Kamehameha

One-Handed Kamehameha (Katate de Kamehame)
Is Kamehameha vartion used by Master Roshi and Future Gohan, Future Gohan used this kamehameha because he had only one arm, also Teen Gohan used this in the beam clash of Cell. And One-Handed kamehameha is used in ROF, so its canon, this is similar to the Energy Wave technique but stronger, Gohan's One-Handed Kamehameha is called Father-Son Kamehameha, Master Roshi used this when he probably had a broken arm, the same like Gohan's Father-Son Kamehameha, but it isn't strong as Future Gohan's One-Handed Kamehameha.